UNITED STATES DEPARTMENT OF THE INTERIOR Harold L. Ickes, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director

Bulletin 939-D

GEOPHYSICAL ABSTRACTS 111

OCTOBER-DECEMBER 1942 V

COMPILED BY . W. AYVAZOGLOU

UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1943

For sale by the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. Price 10 cents Geophysical Abstracts 1-86, May 1929-June 1936, were issued in mimeographed form by the Bureau of Mines, United States Department of the Interior. The geophysical section was transferred to the Geological Survey July 1, 1936, and Abstracts 87-111 have been published in bulletins of the Geological Survey, as follows: Bulletip 887, Geophysical Abstracts 87', July-December 1936. Bulletin 895, Geophysical Abstracts 88-91, January-December 1937. Bulletin 909, Geophysical Abstracts 92-95, January-December 1938. Bulletin 915, Geophysical Abstracts 96-99, January-December 1939. Bulletin 925, Geophysical Abstracts 100-103, January-December 1940. Bulletin 932, Geophysical Abstracts 104-107, January-December 1941. Bulletin 939, Geophysical Abstracts 108-111, January-December 1942. By Departmental Order of October 5, 1942, the geophysical section was trans­ ferred back to the Bureau of Mines. n CONTENTS

Page 1. Gravitational methods.-.______.______._._! ..._.____ 99 2. Magnetic methods.__.._.___..___..____.___..___ .-____-_--_-_... 100 3. Seismic methods.___.__..____.__--____-_-___._-_-_.__-____- ... 100 4. Electrical methods..__------_-----_-___-___.._-___-____.-.-_- 105 5. Radioactive methods._---_---_--_ _---..--__--_---___--..__----__ 107 6. Geoihermal methods_____-__,-__---_-_--..__-..__-__-_-_---_-_.__ 109 7. Geochemical methods.____.__. __-_-_-_.-___-,-_---_--_-_---__._- 109 8. Unclassified methods and topics related to geophysics__. -..._-_-_. 109 9. New publications.-.----_-.__-___---_-_-_---_-__.-.---.__.___- ._ Ill 10. Patents,.-.._.._...._...._...... _. _. .__...... _.._..." Ill Index to Geophysical Abstracts 111, October-December 1942.___._.____ . 123 Index to Geophysical Abstracts 108-111, January-December 1942_..._-- 125 in-

GEOPHYSICAL; ABSTRACTS 111, OCTOBER-DECEMBER 1942

Compiled by W. AYVAZOGLOTJ

1. GRAVITATIONAL METHODS 6697. Clewell, D. H., Problems in temperature control of gravimeters: Geo­ physics, vol. 7, No. 2, pp. 155-168, Menasha, Wis., 1942. The theoretical considerations entering into the design of thermo­ statically controlled ovens for gravimeters are presented. The author points out that, to obtain the most uniform temperature distribution without the use of excessive amounts of material, plural thermostat control points on the heater element are desirable. To reduce long­ time fluctuations, it is recommended that dual thermostating be em­ ployed in which an inner controlled shell is surrounded by an outer thermostated layer held at an approximately constant temperature several degrees lower than the temperature of the inner shell. Author's abstract. 6698. Filmer, E. A., Spiral springs in gravity measurement secondary twist of spiral springs in measurement of variations in value of acceleration of gravity: Pan-Am. Geologist, vol. 76, No. 1, pp. 27-28, Des Moines, Iowa, 1941. Experiments by the author lead him to conclude that an advantage is gained in using the twist effect of a spiral spring in gravity measure­ ments rather than the extension effect in such a spring because, by the twist effect, very minute angular displacements may be measured accurately by means of an optical lever. The arrangement is briefly described. Such factors as cross section of the wire (circular or rectangular), size of ribbon, thickness, number of turns, and nature of material are to be investigated more closely. The advantages of such an instrument would be its weight, portability, speed in taking readings, and low cost. W. A. 6699. Lawson, A. C., Mississippi delta a study in isostasy: Geol. Soc. America Bull., vol. 53, No. 8, pp. 1231-1254, Washington, D. C., 1942. The work of Barton, Russell, and the. Geological Survey of Louisiana has shown that the Mississippi delta is over 30,000 feet thick and that it has subsided part passii with the deposit of sediment. They have con­ sidered isostasy as an explanation of this subsidence, and Barton has rejected the explanation. Russell and others have not satisfied them­ selves that this subsidence and the great thickness of the delta are due to the maintenance of an isostatic balance which was disturbed by sedimentary loading. The. reason for the failure to establish the operation of the principle of isostasy is due to the fact that the load of water displaced by the delta has been ignored as a primary factor in the problem. No cognizance has been taken of the depth of the sea into which the delta was built. In the present paper it is shown that a delta like that of the Mississippi built out into deep water will sub­ side under sedimentary load and will maintain isostatic balance through- 99 100 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

out its growth, up to a limit of thickness which is determined by the initial depth of water. Russell's view that the alteration of degradation and aggradation of the surface of the delta is due to the fall and rise of sea level caused by glaciation and deglaciation in Pleistocence time i& accepted as proved. Author's abstract. 6700. Siegert, A. J. F., A mechanical integrator for the computation of gravity anomalies: Geophysics, vol. 7, No. 4, pp. 353-366, Menasha, Wis., 1942. With the instrument here described the gravity anomaly caused by an arbitrarily given finite body can be computed. The integrator is . operated by tracing the contour lines representing the body in a man­ ner similar to the operation of a planimeter. The instrument is use­ ful mainly in the indirect method of interpretation of observed gravity anomalies, in the computation of terrain corrections, and in the evalua­ tion of magnetic anomalies. Its design is based on a formula which ex­ presses the gravity anomaly caused by an infinitely thin slab, bounded by a closed curve, as a line integral over this curve. Author's abstract. 6701. Skeels, D. C., The value of quantitative interpretation of gravity data: Geophysics, vol. 7, No. 4, pp. 345-353, Menasha, Wis., 1942. Although there is no unique interpretation of a given set of gravity data, there are many cases in which quantitative interpretation is de­ cidedly worth while. This is especially true in cases where the gravity data are supplemented by a certain amount of geological data or where the gravity anomaly is of such a shape that the range of possible solu­ tions can be rather closely limited. Three examples are given of in­ terpretations of actual data. Author's abstract.

2. MAGNETIC METHODS

6702. Observatorio Nacional de Tacubaya, Mexico: Universiclad Nacional, Sec- cion Magne"tica, 1942. Three isomagnetic maps on a scale of 1 : 5,000,000 show magnetic declination, inclination, and horizontal intensity, together with their changes calculated for the year 1942, and the lines of equal annual change (isopors). W. A.

3. SEISMIC METHODS 6703. Byerly, Perry, Microseisms at Berkeley and surf on nearby coasts: Seis- mol. Soc. America Bull., vol. 32, No. 4, pp. 277-282, Berkeley, Calif., 1942. The amplitudes of microseisms recorded at Berkeley correlate over 6-month and yearly periods with surf strength on nearby beaches quite as well as the observations of surf strength at adjacent stations cor­ relate with each other, all the correlation ratios being between 0.53 and 0.58. During a winter month the correlation between microseisms and surf rose to 0.81. -A consideration of energies leads to the con­ clusion that the energy of average large microseisms at Berkeley can be explained as due to surf on nearby beaches if about 10~7 of the potential energy of probable-sized deep-water waves is eventually transformed into elastic Rayleigh waves at the nearby beaches. Not all microseisms at Berkeley are caused by nearby surf, but many may very well be. It is possible to pick periods when one is large and the other is not, and vice versa. It is also possible to find times when very SEISMIC METHODS 101

heavy seas and very large microseisms begin together in a most con­ spicuous fashion. Author's summary and conclusions. 6704. Dobrin, M. B., An analytical method of making weathering corrections: Geophysics, vol. 7, No. 4, pp. 393-399, Meinasha, Wis., 1942. A method of weathering is described by which intercept times can be rapidly and accurately computed from first arrival times without the plotting of time-distance curves. The velocities are determined by a mechanical procedure, based on least-squares theory, which normally requires no exercise of judgment on the part of the computer. The application of the method to actual field set-ups is illustrated by sample calculations. Author's distract. 6705. Earthquakes in New Zealand.: Dominion Observatory, Bull. S. 63, 4 pp., Wellington, 1942. The first part of this article, prepared by J. Henderson, Director of the Geological Survey of New Zealand, deals with geologic considerations concerning earthquakes and volcanic activity in New Zealand. The second part, written by R. C. Hayes, Acting Director of the Do­ minion Observatory, contains information on seisrnicity and distribution of earthquakes, deaths due to earthquakes, and investigations of earth­ quakes in New Zealand. W. A. 6706. Eby, J. B., and Harking, T. I., Geophysical history of Darrow dome, Ascen­ sion Parish, La.: Am. Inst. Min. Met. Eng. Tech. Pub. 1495, 8 pp., New York, 1942. This paper outlines the geophysical investigation of the area covering the Darrow salt dome, Louisiana. Surveys with the refraction seismo­ graph and torsion balance failed to disclose the dome, but reflection-dip shooting was successful and was confirmed by later drilling. Authors' abstract. 6707. Faust, L. Y., Geophysics in the Mid-Continent: Geophysics, vol. 7, No. 3, pp. 272-274, Menasha, Wis., 1942. The Mid-Continent has been the scene of the most effective use of geophysical methods, particularly of the reflection seismograph. By using Lahee's "Wildcat drilling in 1940" and his report for 1941 (Am. Assoc. Petroleum Geologists Bull., vol. 25, No. 6, pp. 997-1003, June 1941, and vol. 26, No. 6, pp. 969-982, June 1942), in which Lahee tabulated for each State the number of discoveries and dry boles credited to each method of exploration, Faust combines the figures for geology and geophysics, and thus he obtains the truest comparison among the States. His figures, averaged for 1940 and 1941, follow: Ratio of dry holes State: to producers Oklahoma ______2. 4 Arkansas__.______3.3 Kansas ______3. 6 Louisiana ______3. 9 Illinois ______;______4. 4 Texa s ______5.2 California ______7.0 Faust concludes that the territory offering probabilities for widespread geophysical activity in the Mid-Continent lies in Nebraska and the Dakotas. There are large regions where reflections of good quality can be obtained and where major oil fields probably exists W. A. 102 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

6708. -Freeman, L. I., Geophysics in Canada: Geophysics, vol. 7, No. 3, pp. 274-275, Menasha, Wis., 1942. This is an abstract of the paper presented at a joint session of the American Association of Petroleum Geologists and the Society of Ex­ ploration Geophysicists at the annual meeting, Denver, Colo., (April 22, 1942. An outline of the abstract follows: Geophysical methods, chiefly the reflection seismograph but also some gravity-meter work, are being used from the "foothills" area in western Alberta through the plains of Alberta and Saskatchewan and as far east as Prince Edward Island. Most of the work is in the "plains" area of Alberta and western Sas­ katchewan. The foothills area, including Turner Valley and other localities close to the mountains, is more difficult to shoot. Because of prolific production of oil and gas in Turner Valley, exploration doubt­ less will continue in the foothills area, although the cost per acre is high. In the large area of possible "plains" structures many field crews probably will be active during 1942. During 1941, at least six major operating companies from the United States had nine seismograph crews and three gravity-meter crews in Alberta and Saskatchewan. One seismograph crew worked in Prince Edward Island. W. A. 6709. Gillin, J. A., Shock, Lorenz, and Alcock, E. D., An application of seismic surveying to the location of bauxite in Arkansas: Geophysics, vol. 7, No. 4, pp. 400-405, Menasha, Wis., 1942. The exploration for bauxite has been greatly stimulated by the in­ creased demand for aluminum. The geology of the formation of bauxite in Arkansas is closely related to the syenite exposures of the old land surface at the end of Midway time. A refraction seismic survey mapped the attitude of the high-velocity formations identified as syenite or Paleozoic rocks. By combining this map with a map of the Midway from scattered boreholes, a map of the old land surface at the end of Midway time was obtained. By interpreting this map, future explorations by core drills can be guided to the most favorable locations. Authors' abstract. 6710. Gutenberg, Beno, and Richter, C. F., Earthquake magnitude, intensity, en­ ergy, and acceleration: Seismol. Soc. America Bull., vol. 32, No. 3, pp. 163-191, Berkeley, Calif., 1942. In this paper the writers develop and investigate (1) the relation of the magnitude to the energy released in an earthquake, and (2) the relation of intensity on the Modified Mercalli Scale of 1931 to instru- mentally determined acceleration. They also investigate the connec­ tion of both magnitude and intensity with other physical elements of an earthquake, largely with the help of an empirical equation con­ necting magnitude with acceleration at the epicenter. .They discuss the effect of focal depth on all the quantities. W. A. 6711. Hodgson, E. A., Velocity of elastic waves and structure of the crust in the vicinity of Ottawa, Canada: Seismol. Soc. America Bull., vol. 32, NO. 4, pp. 249-256, Berkeley, Calif., 1942. Ten seismograms of rock bursts at Lake Shore mines, Kirkland Lake, Ontario, were recorded on a Benioff seismograph at Ottawa, 279 miles away. Though the bursts were within a few feet of one another, for the purpose of preparing traveltime tables they are considered to have occurred at a single point at the surface. Six phases were registered SEISMIC METHODS . 103

on each seismogram. Five of these are well defined on nearly all the records. _ It is thus possible to deduce a set of arrival times at a dis­ tance of 279 miles for a burst occurring at the surface. As all the read­ ings may be combined, this set of times is known with fair precision. The distance is determined within 1 part in 7,000, the depth within 2,000 feet, and the traveltimes within an error of ± 5 seconds. The records obtained will afford a means of deducing the earth struc­ ture and velocities in the vicinity of Ottawa and will permit the con­ struction of tables for rock bursts and blasts in that area up to 10° (690 .miles). These tables will be prepared and issued with corrections so that they may be used for local earthquakes with finite focal depth. Author's summary, condensed by W. A. 6712. Jeffreys, Harold, The times of sP and sPKP: Royal Astron. Soc. Monthly Notices, Geophys. Suppl., vol. 5, No. 2, pp. 31-32, London, 1942. By an oversight these two phases were omitted from the calculation of traveltimes by Bullen and myself. (See Geophys. Abstracts 99 and 101, Nos. 5199, 5200, 5201, 5493, and 5494.) The calculation presents* no special complications. In the present tables, I give first the interval between P and sP, and then the depth allowance, which is the difference between the times of sP for the actual depth and for a surface focus; the latter is the same as that of P for a surface focus. It varies much less with distance for a given focal depth and is therefore easier to interpolate. Since the effect of depth on PKP has already been given in the form of depth allowances, I give that on sPKP also in this form alone. The interval sPKP-PKP will then be obtained by adding the allowances without regard to sign. The column for 15 km. refers to a focus at the base of the upper layer, for h/R=Q.QQ to one at the base of the intermediate layer as usual. Author's abstract. 6713. Jeffreys, Harold, The deep earthquake of 1934, June 29: Royal Astron. Soc. Monthly Notices, Geophys. Suppl., vol. 5, No. 2, pp. 33-36, London, 1942. The data for this earthquake given in the I. S. S. do not support the depth of O.OlljR that has been attributed to it. The pP-P and sS-s in intervals are too inconsistent to give a good determination of depth in this case, though they have usually been found valuable in others. A solution from P, S, and SKS together indicates that the focal depth was 0.0969B ±0.0007^2 and that the epicenter was about 0.8° south of the position given by Berlage and reproduced in the I. S. S. There were numerous observations of PKP on the receiving branch (PKIKP), which provide a check on the earthquake used to provide empirical times for this branch. It is suggested that the present times need an increase of about a second. Author's abstract. 6714. Leypoldt, Harry, and McHenry, J. R., Block pattern of crustal movements in Long Beach: Seismol. Soc. America Bull., vol. 32, No. 4, pp. 269-276, Berkeley, Calif., 1942: Earth movements in the Los Angeles-Long Beach Harbor area have been noted since 1923. The periodical rise and fall of the crust in the vicinity of tide gages has been continuously recorded for Los Angeles Harbor on standard gages of the United States Coast and Geodetic Sur­ vey since 1926. This paper discloses that the movements in Long Beach occur in blocks that tilt independently of one another. W. A. 525039 i3 2 104 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

6715. Salvatori, Henry, Geophysics on the Pacific coast: Geophysics, vol. 7, No. 3, pp. 268-270, Menasha, Wis., 1942. An average of only 40 million barrels of oil a year .have been discovered in California during the past 3 years. To meet the demand for oil in this strategically important Sta.te during the war, it is estimated that about 300 million barrels of new oil a year must be discovered. Salvatori ex­ amines the steps and direction of the near-future exploratory efforts to in­ crease the discovery of new oil reserves and concludes that, as there are now no methods of exploration in sight that may be more effective than the reflection-seismograph method, to which the geophysical work in Cali­ fornia has been largely confined, the geophysicists must do more with the methods already known. W. A. 6716. Swan, B. G., Local area! distribution of velocities in the Texas Gulf coast: Geophysics, vol. 7, No. 4, pp. 367-392, Menasha, Wis., 1942. This paper presents velocity data, obtained from long reversed-profile surface shooting on three Texas Gulf coast projects. Velocity de­ terminations were distributed areally in sufficient detail to permit con­ struction of "Isotime" contour maps representing velocities to a time datum. Maps are presented showing the resulting corrected seismic structure. Also presented are time-depth curves of two profiles with curves of nearby well-velocity surveys. Two comparisons are made of velocities at common points determined by the long velocity profiles and by time A£ analysis of shorter spreads/ Data presented show that velocities determined in the manner de­ scribed are quite variable over local areas but can be contoured into fairly regular patterns and that if applied to the ordinary seismic data profound changes in structural interpretation are effected; that major discontinuities in velocity stratification may be detected; that in the two examples described, velocities obtained from 5,400-foot reversed re­ flection profiles are higher than those obtained by time A* analysis of 1,800-foot reversed profiles; and that velocity anomalies determined from surface profile shooting may be associated with faulting in the sub­ surface beds. Author's abstract. 6717. Ulrich, F. P., Progress report of seismological work by the United States Coast and Geodetic Survey in the western United States during 1941: Seismol. Soc. America Bull., vol. 32, No. 4, pp. 283-296, Berkeley, Calif., 1942. During 1941 the Coast and Geodetic Survey continued its regular seismological program in the Western States (see Geophys. Abstracts 108, No. 6409). This program consists in operating a network of sensitive seismograph stations, operating a large number of strong- motion seismograph stations, gathering and preparing for publication all available information on felt earthquakes, and a limited amount of instrumental development and vibration work. This report, containing the results of the work done during 1941, is summarized under the following headings: (1) Questionnaire pro­ gram; (2) important earthquakes of 1941; (3) seismic field investiga­ tions; (4) sensitive seismograph work; (5) strong-motion work; (6) tiltmeter work; (7) vibration work; and (8) instrumental work. The Washington Office issued the annual report, United States Earth­ quakes, 1939, and a revision of Serial 609, Earthquake history of the United States, Part 2, California and western Nevada. A special report, ELECTRICAL METHODS 105

Analysis of the El Centre accelerograph record of the Imperial Valley earthquake of May 8, 1940, was also issued. W. A. 6718. Wadswor.th, J., The Wiechert vertical seismograph an improved design: Royal Astron. Soc. Monthly Notices, Geophys. Suppl., vol. 5, No. 2, pp. 48-53, London, 1942. After describing the seismograph in its original form, the author discusses the improvements and modifications of the instrument and tabulates the constants of the vertical seismograph at Apia at various stages of its history. W. A. 6719. Wilson, J. T., Surface waves in a heterogeneous medium: Seismol. Soc. America Bull., vol. 32, No. 4, pp. 297-304, Berkeley, Calif., 1942. Although several studies have been made of the propagation of sur­ face waves in mediums in which elastic constants are a function of depth, most of the solutions to the problems are either complex or only approximate. It is still laborious to calculate the dispersion curves. The author discusses mathematically ways in which to obtain solutions for the propagation of Love and Raleigh waves in a medium in which the elastic properties are exponential functions of the depth. W. A. 6720. Wood, H. O., Earthquakes and disturbances to leveling in the Imperial Valley, 1930-31:. Seismol.. Soc. America-Bull., vol. 32, No. 4,' pp. 257-268, Berkeley, Cajlif., 1942. Comparison in 1931 of the findings .of field investigations in 1930 of the earthquakes of February 25 and March 1 of that year in the Imperial Valley, Calif., with disturbances to -leveling found in the 1931 retracement of precise leveling surveyed ih 1926-27 and 1928 by the United States Coast and Geodetic Survey, led to the conclusion that there was no discernible correlation except ^in one instance, and that doubtful. Occurrence of the 1940 earthquake, with the disclosure of a surface-fault offset, necessitates review and reconsideration. The revised conclusion is that two of the disturbances to leveling found in 1931 may probably be correlated with activity on this fault zone, but that the disturbances are quite as likely due to secondary effects 'caused by shaking as to primary surface warping or tilting and probably more so. The necessity of frequently repeated precise surveys is emphasized. Aiithor's abstract.

4. ELECTRICAL METHODS o 6721. Fritsch, Volker, Der Einfluss des Wassergehaltes geologischer Leiter auf deren elektrische Eigenschaften [Influence of the water content of geologic conductors upon their electrical properties] : Schweizer. niin. pet. Mitt., vol. 19, No. 1, 1939, pp. 224-250. 1. Saturation exerts a definite influence on the electrical properties of geologic conductors. 2. Small traces of moisture in geologic conductors can be determined electrically with more accuracy than by weighing. 3. The change of the electrical properties in connection with satura­ tion is often characteristic of a given geologic conductor. 4. Methods developed for determining the electrical properties of a geologic conductor as a function of saturation are described. Author's abstract, translated ~by W. A. 106 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

6722. Fritsch, Volker, Geoelectric constitution of the subsoil and lightning pro­ tection : Naturwissenschaften, vol. 29, pp. 397-403, Berlin, July 4, 1941. The importance of the geoelectric features of the subsoil in relation to the likelihood of lightning strokes in a specified area is stressed. The determination of the probability of danger and the protective range of lightning conductors is discussed with the aid of diagrams. "The establishment of test fields in open country is recommended; a field at Abroth is briefly described. H. G. 8., Sci. Abstracts, vol. 45, No. 535, 1942. 6723. Way; H. J. R., An analysis of the results of prospecting for water in Uganda by the resistivity method: Inst. Min. Metallurgy Bull. 455, pp. 1-26, London, 1942. It has been shown how most of the sites selected geophysically and drilled in the underground water-supply development in Uganda have been over acid igneous and metamorphic rocks with the peculiar local development of a pseudostratification at the surface of laterite, decom­ posed rock, and solid rock. It has therefore been possible to assemble and correlate geologic and resistivity data for an analysis. Types of resistivity curves have been classified into five groups, and the signifi­ cance of each type of curve has been interpreted. The overlapping of values from the adequate and inadequate sites has been described, and the extent of the overlapping may be taken as an indication of the reliability of the various criteria. The conclusion is drawn that, although it is impossible to guarantee an adequate water supply at any particular site chosen by the methods and under the described geologic conditions, the chances of success are of the order of 80 percent. Aiithor's sutrumary, condensed ~by W. A. 6724. Wolf, Alfred, The inipedance of a grounded wire: Geophysics, Vol. 7, No. 4, pp. 414-418, Menasha, Wis., 1942. The impedance of an insulated wire stretched along the surface of the earth, regarded as a homogeneous conductor, is a function of frequency and of the conductivity of the earth. Formulas are given for the in­ ductance and the resistance of such a wire which are applicable under conditions met with in geophysical prospecting. Author's abstract. 6725. Zinzer, R. H., The use of electrode spacing in well logging [abstract]: Oil and Gas Jour., vol. 41, No. 24, p. 48, Tulsa, Okla., 1942. An effort has been made to establish an empirical correlation between formation resistivity for a series of electric-log curves and water satura­ tion and oil productivity of sand. Electric logs were obtained by "record­ ing with 10 different electrode spacings through the same intervals of a well. In the analysis of these curves all factors except two, a dependent and independent variable, were held constant. The interval studied had been cored, and a large number of samples were "analyzed in the core laboratory in order to compare the values of permeability and sat­ uration with the measured values of formation resistivity. Results of this analysis indicate, first, the depth to which mud filtrate enters a sand body; second, a correlation between permeability and sand resistivity for shallow penetration depths; and third, that the water saturation for an oil sand can be determined from the measured sand resistivity after making suitable corrections for sand thickness. The procedure in the last method depends on a thickness-factor correction and a theoretical RADIOACTIVE METHODS 107

curve. The accuracy of the theoretical curve is now being tested in the laboratory. 5. RADIOACTIVE METHODS / 6726. Bullard, E. C., Radioactive heat generation in rocks: Royal Astron. Soc. Monthly Notices, Geophys. Suppl., vol. 5, No. 2, pp. 41-47, London, 1942. The heat generation of Ra, Th, and K is considered. It is concluded that the best values are: 7.0 X 10 2 cal./sec. gm. Ra (0.72 cal./gm. U yr., 2.20 X 10" cal./gm. Ra yr.) 6.3 X 10~" cal./sec. gm. Th (0.200 cal./gm. Th yr.) 2.5 X 10 - cal./sec. gm. K (8 X 10 ~6 cal./gm. K yr.) The results for Ra and Th should be correct within 2 or 3 percent, but that for K might be in error by 50 percent. The value for potassium is considerably less than those previously accepted, and only 5 to 10 percent of the heat generated by radioactivity in a rock is produced by potassium. It seems unlikely therefore* that the radioactivity of potas­ sium has any important geological consequences. Author's abstract, 6727. Conclin, G. M., Gamma-ray well logging in Trinidad: Inst. Petroleum jour., vol. 28, No. 223, pp. 141-145, London, 1942. The author briefly describes the phenomenon of radioactivity methods of measurement by gamma-ray well logging and the possible uses of the gamma-ray log. With regard to this kind of well logging in Trinidad, he makes the following conclusions: "Since, in many cases, oil and water are not radioactive to the extent necessary to influence the logging instrument, the gamma-ray unit does not differentiate between oil- and water-sands. In Trinidad, however, it is evident in many cases that the oil-sands show more deflection ou the log than do the water-sands. This can be due to at least two causes: First, there, may be less porosity of, or more clay in, the oil-sand; second, the oil may be radioactive because of the presence of radon. It is known that radon is absorbed much more readily by oil than by water; hence, if the oil were radio­ active and the porosity of the oil and water horizons the same, then the oil-sand would show more deflection than the water-sand. Since a complete knowledge of porosity would be needed to prove or disprove this premise, it is practically impossible at this time to make any posi­ tive- statement." Illustrations for this paper are published in vol. 28, No. 224, pp. 172-175 of the 'journal. W. A. 6728. Keevil, N. B., Jolliffe, A. W., and Larson, E. S., The distribution of helium and radioactivity in rocks helium-age investigations of diabase and granodiorites from Yellowknife, Northwest Territory, Canada: Am. Jour. Sci., vol. 240, No. 12, pp. 831-846, New Haven, Conn., 1942. Helium indices of a diabase and its constituent minerals (1000, 120, 1640, 810, 4800) were found to be generally higher than those for the granodiorites that are cut by the diabase (369, 147, 154, 585, 117, 90, 264), showing that the results are unreliable for purposes of cor- ; relation. The date for granitic rocks are comparable with these for Algoman intrusives elsewhere, so that the diabase and later faulting and min- lOSjGEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942"

eralization are probably post-Algoman. The spurious results for sam­ ples derived from diabase are thought to be due to contamination by magmatic helium, either during crystallization or in deuteric proc­ esses.- The value 16,700 found by substituting experimental data for magnetite in the simple age equation suggests that caution must be exercised in using this mineral in helium-age investigations. Authors' abstract. 6729. Piggot, C. S., and Urry, W. D., Time relations in ocean sediments: Geol. * Soc. America Bull., vol. 53, No. 8, pp. 1187-1210, Washington, D. C., 1942. Dates are given for geologic events in the North Atlantic based on the studies of cores of the sediments under this ocean. The radiuni in a core of red clay from the Pacific Ocean was determined with the object of throwing light on the high concentration of radium in the surface of red clays in general and of studying the rates of deposition of red clay. The rates of deposition, both past and present, are given for all the core samples studied. The rates for the upper parts of the cores probably are nearly correct, but those for the lower parts may : not be. Today deposition is probably as rapid as, if not more rapid than, at any time during the period represented by the cores studied. W. A. 6730. Radioactivity logging proves help in reworking old wells [editorial]: Oil and Gas Jour., vol. 41, No. 7, p. 140, Tulsa, Okla., 1942. Radioactivity logging has made possible a greater degree of pre­ cision in the location of possible oil-bearing formations that may be cemented off behind casing in old holes. The method tells nothing about the porosity, permeability, or fluid content of the porous forma­ tion. It merely shows the position of sandstones or limestones and shales. Logs may be made in cased or uncased holes. The gamma rays emitted by elements in the formations are detected by use of an ionization chamber, the gas in which is a nonconductor, except when rendered conducting by the action of the gamma rays. The current passing through the gas is amplified and recorded continuously at the surface. Sands and limestones generally have feeble radioactive properties, but shale beds have stronger radioactive properties. Salt has low radioactivity, and anhydrite even less. Radioactivity surveys have been used mainly for correlation and for the development of new production from cased-off sands. The sur­ veys have also1 shown unknown faults, wedging beds, and that some wells have not been drilled deep enough. They are useful in checking depth measurements, in setting casing, and in detecting the position of cement if the cement contains a little radioactive material. O. D. H., Inst. Petroleum Jour.', vol. 28, No. 224,19J2. 6731. Sawdon, W. A., Locating cased-off productive zones: Petroleum Eng., vol. 13, No. 8, p. 55, Dallas, Tex., 1942. There is much economically recoverable oil cased off in various fields in the United States of America, and probably all of it can be made recoverable without the use of new casing. The cheapness of the recovery will depend on how readily the cased-off oil zones can be located. In some cases data obtained during drilling will facilitate the location of these cased-off horizons, but in many older wells there are no reliable logs, so that radioactivity logging is of value in locating UNCLASSIFIED METHODS 109'

these horizons. Radioactivity logs will provide general geologic in­ formation, and they can be made in cased holes. The intensity of the rays is decreased by steel casing and cement, but logs have been made through five strings of cemented casing. An ionization chamber with an amplifier is run in the well, and a continuous record is made at the surface. The sensitivity is adjusted to meet the conditions encoun­ tered. A high-amplitude log gives a sharper definition of minor changes in the character of the formations. Electrical logs, when available, facilitate the interpretation of the radioactivity logs. In. California the shales are generally much more radioactive than the sands, although there are difficult areas. A number of radioactivity logs are included with electrical logs for comparison, and examples are given of the application of radioactivity surveys. G. D. H., Inst. Petroleum Jour., vol. 28, No. 224, 1942. 6732. Stick, J. C., Jr., Radioactivity logging in California [abstract]: Oil and Gas Jour., vol. 41, No. 24, pp. 46-48, Tulsa, Okla., 1942. Radioactivity logging in California has offered the widest scope for investigation yet encountered, both from the standpoint of the geological complexity and the variety of formations experienced. Recent experi­ mental efforts have been directed toward the development of a curve which will record through casing the amount of fluid contained within formations. The result of these investigations has been the recent introduction of the neutron curve. The neutron curve responds pri­ marily to the amount of hydrogen within the zone of measurement. It is accomplished by bombarding the formation with a strong source of neutrons. The neutron is one of seven fundamental particles of matter. Its mass is about 1,800 times that of the more familiar electron. Due to the nearly equivalent mass of the neutron and hydrogen nuclei, the latter has the particular ability to slow down the neutrons to a far greater extent than any other common element of substance. Bombard­ ment of the formation by neutrons results in the emission of hard gamma rays from the solid portion of the rock. A portion of these gamma rays, in turn, reaches the measuring instrument which, as in the case of the gamma-ray curve, is an ionization chamber. Results so far obtained indicate that the gamma-ray curve can be utilized to advantage in defin­ ing formations through casing in the majority of California fields. The use of the neutron curve for stratigraphic studies has been of material benefit in areas indicating unusual gamma-ray characteristics. The neutron curve also opens up a new field of investigation for the study of formation porosity. 6. GEOTHERMAL METHODS NOTE. No abstracts on geothermal methods in this quarterly number. 7. GEOCHEMICAL METHODS NOTE. No abstracts on geochemical methods in this quarterly number.

8. UNCLASSIFIED METHODS AND TOPICS RELATED TO GEOPHYSICS 6733. Hoover, Herbert, Jr., Contribution of geophysics to national effort: Geo­ physics, vol. 7, No. 3, pp. 276-280, Menasha, Wis., 1942. Responsibilities facing applied geophysics in connection with the war are discussed, and the importance of maintaining qualified and experi- 110 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

enced geologists and geophysicists for carrying forward research and development of geophysical exploration is-emphasized. W. A. 6734. McKee, J. P., Application of time logs to porosity studies in central Kansas wells: Oil and Gas Jour., vol. 41, No. 17, pp. 56-66, Tulsa, Okla., 1942. Time, electric, radioactivity, and sample logs have been used advan­ tageously in studies of areas thought to have Lansing-Kansas City lime­ stone prospects. Each method of logging a well may contribute valuable information not available in the other methods. Using all the data promotes better understanding of operators' problems and frequently helps to solve them. Diagrams of the time log, the potential curve of an electric log, and the radioactivity log are similar. W. A. 6735. Peacock, H. B., How can geophysicists best serve?: Geophysics, vol. 7, No. 3, pp. 259-267, Menasha, Wis., 1942, and Am. Assoc. Petroleum Geolo­ gists Bull., vol. 26, No. 7, pp. 1200-1206, Tulsa, Okla., 1942. According to recent figures compiled by the American Petroleum Insti­ tute, the estimated reserves of oil in the United States as of January 1, 1942, were 19,586,296,000 barrels. Production for 1941 amounted to 1,404,182,000 barrels. In giving these figures, Peacock points out that owing to the greatly increased demand for oil during the war the known reserves . must naturally be greatly increased; thus, new discoveries must be made. He discusses the opportunities offered by the proved geophysical methods of prospecting. In answering the question, "How can geophysicists best serve?" he concludes that any reduction of geo­ physical activity or of-its efficiency cannot be permitted at this time; that every effort should be made to increase the effectiveness of the known geophysical methods of oil finding and to search for new meth­ ods ; and that the specialized training of geophysicists must be used to its fullest capacity wherever they serve. W. A. 6736. Wilson, J. H, Geophysics in the Permian Basin: Geophysics, vol. 7, No. 3, pp. 270-271, Menasha, Wis., 1942. The application of geophysics in the Permian Basin to war and post­ war problems is largely one of location of new oil reserves. After a brief discussion of the methods of geophysical prospecting applied in this basin (seismic, gravity-meter, torsion-balance, magnetic, electrical, and soil-analysis surveys) Wilson concludes that "the prerequisites for successful prosecution of geophysical exploration and development of new reserves in the Permian Basin are financial incentive, necessary supplies, continued improvement in procedure and equipment, regional coverage, multiple geophysical methods, closer correlation between geol­ ogy and geophysics, and some amelioration of the permit situation." W. A. 6737. Wood, J. T., Geology and development of the Paloma field, Kern County, Calif.: Am. Inst. Min. Met. Eng. Tech. Pub. 1471, 7 pp., New York, 1942. Stratigraphy, structure, and closure of the Paloma field are discussed, with some details regarding the present state of development. The Paloma anticline a large dome modified by faults is the largest single closed dome in the southern San Joaquin Valley without surface out­ crop or topographic expression. It owes its discovery to geophysics. Of nine wells drilled to the Stevens sand, seven are productive. The ultimate productive area may approximate 3,000 acres when the limits of the field are determined. Author's abstract. - PATENTS ' 111

9. NEW PUBLICATIONS 6738. Byerly, Perry, Seismology, 256 pp., 58 illus., New York, Prentice-Hall, Inc., 1942. Price, $3.50. The book is divided into two parts. Part 1 sets forth theories and speculations as to the immediate and underlying causes of earthquakes and describes the effects of earthquakes. Part 2 covers instrumental and wave theory, instrumental' observations, and interpretations. W. A. 6739. Centeno-Graii, M., Estudios Sismologicos [Seismological studies], 555 pp.» 2 maps, 5 tables, Caracas, Venezuela, Litografla del Comercio, 1940. Includes a complete catalog of all earthquakes occurring in Venezuela from 1530 to 1939; the relation of these to the geology and geography of Venezuela; studies of the general phenomena of earthquakes peculiar to these tropical regions; a study of the most effective "earthquake- proof" construction, together with a presentation of the author's "elec- trotectonic" hypothesis for the cause of earthquakes and his "laws of coincidences" for predicting future periods of danger. B. B., Econ. Geology, vol. 37, No. 5,1942. 6740. Neumann, Frank, United States earthquakes, 1940, 74 pp., illus., U. S. Coast and Geodetic Survey, Serial 647, Washington, D. C., 1942. Price, * 15 cents. The author summarizes earthquake activity in the United States and the regions under its jurisdiction for the calendar year 1940. He in­ cludes no earthquakes of volcanic" origin in the Hawaiian and Philip­ pine Islands, and only the stronger shocks in the Philippine Islands. He discusses: (1) Noninstrumental results of the earthquakes; (2) seisrnological-observatory results; (3) strong-motion seismograph re­ sults; and (4) tilt observations. He analyzes the El Centre accelero- graph record of the Imperial Valley earthquake of May 8, 1940, and includes a revised analysis of the Helena, Mont., accelerogram of Oc­ tober 31,1935. W. A. 6741. Table of sine and cosine integrals for arguments £rom 10 to 100, prepared by the Federal Works Agency, Work Projects Administration, for the city of New York, 185 pp., 1942. This volume includes a foreword, graphs of Si (a?) and Ci (a?), an introduction, a bibliography, and a table of Si (a?) and Ci (x) integrals. for the range of x between 10 and 100, at intervals of 0.01. This table is an extension of volumes 1 and 2 of sine, cosine, and exponential in­ tegrals published previously (see Geophys. Abstracts 105, No. 6085, and Geophys,'Abstracts 106, No. 6207). W. A.

10. PATENTS 6742. Method of and apparatus for electrically exploring earth formations; Frederic W. Huber, deceased, late of Riverside, Calif., by Schlumberger Well Surveying Corporation, Houston, Tex., assignee: U. S. patent Re- 21,832, issued June 17, 1941. Original patent (2,072,950) issued March. 9,1937 (see Geophys. Abstracts 80, No. 2785). The six claims of the original patent are completed in this reissue by additional claims 7 to 11, inclusive. The invention relates to the 525039 43 3 112 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

method of exploring, for different depths, earth formations traversed by a drill hole by passing current into the formations surrounding the drill hole and simultaneously measuring and comparing the effects of the flow of that current in the part of the formations through one depth relatively close to the drill hole and in the part of the formations through a greater depth than that mentioned. Claims allowed, 11. 6743. Method of determining the petroleum-oil content of earth samples; John G. Campbell, Houston, Tex., assignor to Ralph H. Fash, trustee, Fort Worth, Tex.: U. S. patent 2,227,438, issued January 7, 1941. A method for determining the oil content" of earth samples. It con­ sists in first preparing a series of relatively uniform-sized spots of standard samples of oil of known concentration but of different oil content and then in preparing spots of substantially the same s°ize from oil of unknown concentration extracted from an earth sample. The latter spots are compared and the fluorescence is noted; then the oil content of spots prepared from oil extracted from the earth sample ° is computed on the basis of the known concentration of the stand­ ard spot having approximately corresponding fluorescence. Claims allowed, 6. 6744. Method of determining the petroleum-oil content of earth samples; John G. Campbell, Houston, Tex., assignor to Ralph H. Fash, trustee, Fort Worth, Tex.: U. S. patent Re-22,081, issued April 28, 1942. This reissue of the original patent 2,227,438 is completed by the follow­ ing seventh claim: "The method of exploring for subterranean oil deposits by analysis of earth samples, which consists in preparing a measured quantity of each sample; subjecting each measured sample to treatment by a measured quantity of a fluid to extract from said sample the petroleum-oil content therein; subjecting the fluid, following each extraction step, to ultra-violet light to produce a fluorescent effect by the action of the ultra-violet light on the petroleum oil in the fluid; noting the intensity of the fluorescent effect; and determining the petroleum-oil content of the fluid and thus its respective earth sample on the basis that the intensity of the fluorescent effect will be in direct proportion to the oil content Claims allowed, 7.. 6745. Gain control for seismometer amplifiers; John P. Minton, Dallas, Tex., assignor, by mesne assignments, to Socony-Vacuum Oil Co., Inc., New York, a corporation of New York: U. S. patent 2,265,538, issued Decem­ ber 9, 1941. An electric seismograph detects seismic waves at a number, of Stations, created in the earth's surface by a detonation of a charge of explosives, by gene'rating electrical signals corresponding to the seismic waves. The seismometer includes independent thermionic devices for amplify­ ing the electrical signals that have been generated by each detector and means for recording the amplified signals on separate traces in coordi- nation. Tvttu time m tne rorm or a seismogram. ' The improvement com­ prises linear gain controls in each amplifier, through which the amplifier of the signals passing through can be controlled. Each of the linear gain controls comprises a series of resistances whose values increase logarithmically; these resistances may be selectively placed in the control grid circuit of at least one of the thermionic amplifying means in each amplifier. The improvement also includes means for linearly adjusting the gain controls of each amplifier according to the variations in ampli- . PATENTS 113

tude of traces representing the recorded signals, whereby (after inspec­ tion of a single record) the gain controls can with one adjustment be set to produce a record having traces on which corresponding signals will have substantially equal amplitude. Claims allowed, 3. 6746. Apparatus for surveying deep wells; William Stanley Knouse, Hollywood, Calif., assignor, by direct and mesne assignments, of one-half to National Lead Co., New York, N. Y., a corporation of New Jersey: U. S. patent : 2,268,256, issued December 30, 1941. In an apparatus of the character described a barrel-like casing; three or more upright supports perimetrically arranged in said casing, each of said supports having permanently sensitive energy-sensitive means dis­ tributed therealong; energy-radiating energizing means for said sensi­ tive means adapted to energize the same in accordance with the amount thereof exposed to its influence; a masking liquid in said casing inter­ posed between said sensitive means and said energizing means, said liquid maintaining it's level in the casing and masking different portions of said supports from said energizing means in accordance with the inclination of said casing; energy circuits from said sensitive means leading to the ground surface; and indicating means actuated by one or more of said circuits to indicate the response of said sensitive means. Claims allowed, 3. 6747. Recording device; Jack Ostins Davis, Portland, England, assignor to Henry Hughes & Son, Ltd., London, England, a corporation of Great Britain: U. S. patent 2,268,808, issued January 8, 1942. An echo-sounding recording device, including a stylus; a recording surface; a drive operable to effect relative cyclic movement between the stylus and the recording surface; a device for signaling, including an actuable element; means operated by the drive of actuating the element in timed relation with respect to a predetermined point in the cyclic movement; provision for changing the drive frofn one constant speed to another; and means operatively associated with the last-named device for effecting a time correction relative to the predetermined point in the operating relation between the actuable element and the actuating device when the constant rate of speed of the drive is changed. Claims allowed, 8. 6748. Multiple-recording galvanometer; John P. Woods, Houston, Tex., assignor to Shell Development Co., San Francisco, Calif., a corporation of Dela­ ware : U. S. patent 2,269,414, issued January 6, 1942. In a multiple-recording galvanometer system, comprising a source of light, a plurality of reflecting galvanometer elements spaced along a substantially straight horizontal line, and a photographic record receiver, light train means to direct light beams from said source to said elements and from said elements to said record receiver, said means comprising an elongated lens having a cylindrical face, the longitudinal axis of said elongated lens being parallel to the line of the reflecting elements in a horizontal plane, said lens having a segment to one side of said plane positioned in the path of the beams traveling from the source of light to the reflecting elements and a segment to the other side of said plane positioned in the path of the beams traveling from the reflecting ele­ ments to the record receiver, whereby said beams are caused to travel along substantially parallel, vertically spaced paths on that side of the lens which is away from the reflecting elements. Claims allowed, 2. 114 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

6749. Adjustable measuring wheel; Adalbert Barry, Houston, Tex.; assignor to Standard Oil Development Co., a corporation of Delaware: U. S. patent 2,269,573, issued January 13, 1942. This invention relates to a measuring wheel comprising a rim adapted to be expanded or contracted, a hub located substantially in the center of said wheel, a plurality of spokes,v each spoke being longer than the distance between the hub and the rim, measured along the radius of the wheel, and attached to both the hub and the rim so that radii passing through corresponding ends of said spokes make angles with these spokes, the other ends of said spokes being spaced away from said radii in the same direction along the circumference of the wheel. Claims allowed, 3. 6750. Limiting amplifier; Murray G. Crosby, Riverhead, N. Y., assignor to Radio Corporation of America, a corporation of Delaware: U. S. patent 2,276,- 565, issued March 17, 1942. This invention relates to a limiting amplifier comprising a pair of thermionic discharge tubes, each having an anode, a grid, and a cathode, said cathodes being so coupled together that a variation in the discharge current of one of said tubes varies the discharge current of the other of said tubes; means for applying a signal to the grid of one of said tubes sufficient to swing said grid beyond cut-off; and an output circuit coupled - to the anode of the other of said tubes, the remaining grid and plate being maintained at a zero signal potential. Claims allowed, 13. 6751. Method and apparatus for measuring thickness; Donald G. C. Hare, Hous­ ton, Tex., assignor, by mesne assignments, to the Texas Co., New York, N. Y., a corporation of Delaware: U. S. patent 2,277,756, issued March 31, 1942. This invention relates to the method of measuring the thickness of a wall from one side thereof, which comprises directing a beam of pene­ trative radiation into said wall from one side thereof and determining from the same side of said wall the amount of radiation scattered in the material of the wall and returned outwardly of said side. Claims allowed, 10. 6752. Oscillograph; William H. Mayne, San Antonio, Tex., assignor to Olive S. Petty, San Antonio, Tex.: U. S. patent 2,279,124, issued April 7,1942. This invention relates to improvements in oscillographs, especially instruments of the multiple-string. time, comprising the combination, with a plurality of parallel oscillograph strings defining a common plane, of means establishing a magnetic field transversely of the strings, said means including opposed pole pieces having parallel faces disposed at an acute angle to the plane of the strings, said pole faces being offset in the direction of a normal to said strings lying in said plane. Claims allowed, 6. 6753. Detection of gas in drilling fluids; John T. Hayward, Tulsa, Okla.: U. S. patent 2,280,075, issued April 21, 1942. This invention relates to the method of detecting gas in well-drilling mud containing gas introduced therein solely from the drill cuttings, which comprises subjecting said well-drilling mud to a change in pressure from substantially atmospheric to subatmospheric and observ­ ing the resulting change in volume thereof. Claims allowed, 5. PATENTS 115

6754. Gas detection; John T. Hayward, Tulsa, Okla.: U. S. patent 2,280,086, issued April 21, 1942. This invention relates to the method of measuring gas in gas- containing liquids, which comprises subjecting a gas-containing liquid to two different pressures, at least one of which is subatmospheric; meas­ uring the electrical speciflc,,resistivi.ties of said liquid at said pressures; and determining ,the,.gas- content , of "said liquid from the difference in said specific resistivities. Claims allowed, 18. 6755. Galvanometer; William W. Miller, Pasadena, Calif., assignor to William Miller Corporation, a corporation of California: U. S. patent 2,282,590, issued May 12, 1942. This invention has for a purpose the provision of an improved d'Arsonval-type of multiple galvanometer, which is adapted for general usage as well as especially suited to the making of photographic seis- rnographic and oscillographic recordings in that it is characterized by greater ruggedness, compactness, and reliability of performance than heretofore attained owing to the manner of combining a plurality of coil assemblies or elements as separate units with a single magnet and to the provision for readily and easily removing and replacing such elements, as well as to features. .of construction and arrangement, whereby the coir elements are effectively damped against transverse and other nongalvanometric or extraneous-vibrations and made more rugged and compact without sacrificing sensitivity, uniformity, 'and accuracy of operation. Claims allowed, 3. 6756. Apparatus for determining fluid contents of solids; William L. Horner, Dallas, Tex., assignor to Core Laboratories, Inc., Dallas, Tex., a cor­ poration of Delaware: U. S. patent 2,282,654, issued May 12, 1942. The present invention relates to a method and apparatus for distil­ ling liquids from the pores of porous rock or sand, such as comprise core samples taken during the drilling of an oil or gas well, for the purpose of making quantitative determination of the liquids present. Claims allowed, 10. 6757. Method and apparatus for subsurface mining; John William Flude, New Orleans, La.: U. S. patent 2,283,200, issued May 19, 1942. This invention relates to locating and mining subsurface mineral bodies. It is particularly concerned with a method of making seismic geophysical observations for the purpose of determining the location and nature of mineral-bearing or petroliferous underwater geologic formations, an apparatus for use "in making such observations, and a method by which geologic formations so identified may be practicably mined. Claims allowed, 11. 6758. Method,of and apparatus for determining the location of water strata in wells; George-H. Ennis, Long Beach,* Calif., ^assignor of one-half to» Robert V. Funk, Long Beach, Calif.: U. S. patent 2,283,429, issued May 26, 1942. In a method of determining points of entrance of a fluid into a well, the steps of (1) distributing a charging material of predetermined light- : transmitting qualities in a selected portion of said well; (2) causing a leakage of fluid into said well to occur; (3) determining the light- transmitting qualities in a selected portion of said well; and (4) deter- 116- GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

mining the light-transmitting qualities of the material at spaced points along said selected portion of said well. Claims -allowed, 11. - 6759. Magnetic logging; James C. Arnold, Los Angeles, Calif., assignor to Lane- Wells Co., Los Angeles, Calif., a corporation of Delaware: U. S. patent 2,288,876, issued July 7,1942. This invention relates to a method of magnetically logging well bores, characterized by rotating an inductor coil simultaneously about two right angularly disposed axes while moving said inductor coil along a well bore; and recording (with respect to the location of said inductor- coil in said well bore) the current fluctuations induced in said inductor coil from the magnetic field traversed by the well bore. Claims al­ lowed, 3. 6760. Electrical logging in oil-filled wells; Merle C. Bowsky, Los Angeles, Calif., assignor to Lane-Wells Co., Los Angeles, Calif., a corporation of Dela­ ware : U. S. patent 2,288,884, issued July 7, 1942.. This invention relates to an apparatus for electrical logging of oil- Jllled well bores, comprising an input circuit and a probe circuit, each including at least one continuously movable contactor physically en­ gaging the walls of said well bore, the input circuit being adapted to establish an electrical field in the formation confronting said well bore and said probe circuit being adapted to sample said electrical field; . and an electrical coupling between said inpu,t and probe circuits (in­ cluding means in said input circuit for balancing the voltage in said probe circuit) said means being so located in said input circuit with respect to said input contactor that the balancing voltage of said means varies directly with the total resistance of said input circuit, including the contact resistance of said input contactor and means tending to maintain a constant flow in said input circuit. Claims allowed, 5. 6761. Well-survey method and apparatus; Jacob Neufeld and Elihu Henry Cooley, Tulsa, Okla., assignors to Well Surveys, Inc., Tulsa, Okla., a cor- - poration of Delaware: U. S. patent 2,288,973, issued July 7, 1942. This invention relates to a method of geophysical exploration that comprises (1) establishing a plurality of electrical-current fields between an electrode in a well bore and a plurality of spaced electrodes on the surface of the earth, and (2) measuring the potential of points on the earth's surface in the vicinity of the surface electrodes as indi­ cations of the configuration of the current fields and hence of the ar­ rangement of the subsurface strata. Claims allowed, 5. 6762. Method and apparatus for logging wells; Robert W. Stuart, Tulsa, Okla.; assignor to Stariolind Oil & Gas Co., Tulsa, Okla., a corporation of Dela­ ware : U. S. patent 2,289,687, issued July 14,1942. This invention relates to the method of logging the subsurface for­ mations encountered in a well during a drilling operation employing a Circulating Stream of drilling fluid, which comprises substantially si­ multaneously and separately measuring variations in the electrical COD.- .' ductivity and the hydrogen-ion concentration of at least a portion of said drilling fluid returning from the bottom of said -well to provide a basis : for distinguishing between substances encountered in said drilling OP* eratiOD Which possess,.relatively high electrical conductivity and Which are substantially neutral and substances which also possess relatively PATENTS 117;

high electrical conductivity but which are not substantially neutral. Claims allowed, 9. 6T63. Well-survey method and apparatus; Jacob Neufeld, Tulsa, Okla., assignor to Well Surveys, Inc., Tulsa, Okla., a corporation of Delaware: U. S. patent 2,289,926, issued July 14, 1942. This invention relates to a method of geophysical prospecting that comprises measuring the radioactive radiations naturally emitted from a formation about which information is desired; measuring the radio­ active radiations from the same formation while irradiating said forma­ tion with radiations from an external source; and combining said measurements to obtain an indication of the effect of said external source of radiations upon the radiations from said formation. Claims allowed', 8. 6764. Thermal process and device for surveying the beds traversed by drill holes; Marcel Schlumberger, Paris, France, assignor, by mesne assignments, to Schlumberger Well Surveying Corporation, Houston, Tex., a corpo­ ration of Delaware: U. S. patent 2,290,075, issued July 14, 1942. This invention relates to a method of determining the nature of earth formations traversed by a borehole, which comprises the steps of (1) generating heat uniformly and simultaneously along an extended portion of the borehole, and (2) obtaining indications of the rate of transmission of the generated heat through the formations surrounding . the borehole in said portion, whereby their relative thermal properties may be ascertained. Claims allowed, 8. 6765. Geophysical-instrument mounting; Robert H. Ray, Houston, Tex., assignor to Stanolind Oil & Gas Co., Tulsa, Okla., a corporation of Delaware: U. S. patent 2,290,354, issued July 21, 1942. In apparatus for mounting and transporting a geophysical instru­ ment, including a vehicle and means for supporting said geophysical instrument when in use in fixed and accurately leveled position within said vehicle, the improved combination which comprises a head assem­ bly on said instrument comprising a pulley member (including a pulley), said pulley member being adapted to carry the weight of said instru­ ment and means projecting perpendicular to the faces of said pulley on each side of said pulley member; means cooperating with said pulley for raising said instrument from said supporting means and lowering it thereon; and a pair of resiliency mounted hooks adopted to cooperate with said projecting means to hold said instrument in raised position independently of said pulley. Claims allowed, 2. 6766. Exploration of boreholes;. Wilbur J. Crites, Bartlesville, Okla., assignor to Phillips Petroleum Co., a corporation of Delaware: U. S. patent 2,290,408, issued July 21, 1942. An apparatus for exploring a well bore while drilling a well, the; combination comprising means for circulating a drilling fluid through the well bore and means for indicating variations in the difference be­ tween the volume of drilling fluid that is introduced into the well bore and the volume of fluid withdrawn from the well bore. Claims allowed, 6. 6767. Gravity-meter; Dayton H. Clewell, Dallas, Tex., assignor, by mesne assign­ ments, to Socony-Vacuum Oil Co., Inc., New York, !N. Y., a corporation of New York: U. S. patent 2,290,740, issued July 21, 1942. 118 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

In an apparatus for geophysical prospecting by the gravimetric method that comprises gravity responsive means; a support; means for pivotally mounting said gravity responsive means on said support; elastic means for maintaining said gravity responsive means in a state of equilib­ rium ; means for indicating variations in vertical displacement of the gravity responsive means due to variations in the force of gravity acting upon the gravity responsive means; and means for'nulling said system, said nulling means comprising additional,elastic means acting longi­ tudinally of and directly upon the first elastic means to effect minor displacements of the gravity responsive means, means for varying the stresses in a portion of said first elastic means while decreasing the stresses in the remainder of said first elastic means, and means for indicating the amount of variation of said stresses necessary to bring the mass to a predetermined position to null the system. Claims allowed, 5. 6768. Electric seismograph; Earley M. Shook and Robert W. Olson, Dallas, Tex., assignors, by mesne assignments, to Socony-Vacuum Oil Co., Inc., New York, N. Y., a corporation of New York: U. S. patent 2,290,773, issued July 21, 1942. This invention relates to an apparatus for receiving and recording, in a distinguishable manner, a time break that is of higher amplitude than voice signals and other disturbing currents by means o'f an electric seismograph, comprising in combination a radio receiving set having a single detecting stage; two amplifying channels, connected in parallel, that are adapted to receive signals from the detecting stage; at least one vacuum tube-in one of the amplifying channels, adapted to amplify all signals from the detecting stage; a speaker unit connected to the out­ put of said amplifying channel, whereby voice communication signals can be received, at least one amplifying tube in the second channel; means for biasing said tube to a point beyond cut-off, said bias being high enough to suppress signals of amplitudes lower than the amplitude level of the time-break signal; and means actuable by the output signal of said tube for recording the output' signal; whereby the' high-amplitude' time- break signal can be recorded free of other signals, such as static and voice communication signals. Claims allowed, 3. 6769. Geophysical prospecting; Gifford E. White, Fredericksburg, Tex., assignor to Standard Oil Development Co., a corporation of Delaware: U. S. patent , 2,291,596, issued July 28, 1942. In a method of geophysical prospecting in which a charge of current is impressed in the earth at one point and the resulting voltage is re­ ceived at a remote point, the step o'f using as the charge a pulse of direct current of substantial magnitude having a duration not substantially in excess of one-thousandth of a second. Claims allowed, 3. 6770. Apparatus for relative gravity measurements; Gustaf Adolf Ising, Djurs- holm, Sweden: U. S. patent 2,291,628, issued August 4, 1942. The present invention relates to a static gravimeter comprising, in combination, a conductive pendulum suspended in such manner as to be able to turn about a horizontal axis; stops restricting the movement of said pendulum to small deflections from a horizontal position, optical means for observing the displacements of the pendulum; a stationary conductor disposed near said pendulum; an evacuated receptacle her- PATENTS 119

metically enclosing said conductors; and means highly insulating one of said conductors so as to- enable it to retain a substantially invariable electrostatic charge, the electrostatic field of which constitutes sub­ stantially the whole compensating force counterbalancing the weight of the pendulum so that successive observations -at different places may be carried out without recharging. Claims allowed, 1. 6771. Magnetic logging; Raymond T. Cloud, Tulsa, Okla., assignor to Stanolind Oil & Gas Co., Tulsa, Okla., a corporation of Delaware: U. S. patent 2,291,692, issued August 4, 1942. This invention relates to an apparatus for exploring the geologic for­ mations traversed by a borehole, comprising a magnetization coil adapted to be lowered into said borehole and, when energized, to set up magnetic lines of force in said borehole and surrounding strata; means for ener­ gizing said magnetization coil (including means for passing a direct current through said magnetization coil and means for reversing said current) ; an expression coil substantially vertically spaced from said magnetization coil; means for rotating one of said coils to cause said exploration coil to cut said magnetic lines of force; means for measur­ ing a fraction of the electromotive force generated in said exploration coil; and means for changing the level of said coils within said borehole while maintaining their spacing. Claims allowed, 4. 6772. Geophysical apparatus and method; William Robertson Welty, San Antonio, Tex., assignor to Olive S. Petty, San. Antonio, Tex.: U. S. patent 2,291,779, issued August 4, 1942. In apparatus for use in seismic surveying, the combination with a plurality of seismometers, each including a casing; means within said casing for converting seismic impulses to electrical-wave-form signal energy and for establishing a field varying with said energy externally of said casing; 'amplifying and recording apparatus; and a conductor, delivering energy to said last-named means, said conductor being looped about the several casings -successively for energization solely by the several fields. Claims allowed, 2. 6773. Photochemical exploration method; Robert O. Smith, For't Worth, Tex.: U. S. patent 2,292,300, issued August 4, 1942. In the art of geophysical exploration for hydrocarbon deposits, the method of detecting concentrations of hydrocarbons over buried deposits by the determination of the saline products in the soil, comprising systematically selecting soil samples over the area; dissolving out the alkaline content of the said samples in pure water; adding a silver nitrate solution to the said alkaline solution; subjecting the mixture to ultraviolet rays for a predetermined period; and measuring the hydro­ carbon content by resultant color and tint variations. Claims allowed, 3. 6774. Method and apparatus for imparting directional magnetic properties to core samples; Philip H. Jones, Redondo Beach, Calif., assignor to Union Oil Co., of California, Los Angeles, Calif., a corporation of California: U. S. patent 2,292,838, issued August 11, 1942. This invention relates to a method of imparting magnetic properties to formation core samples comprising the steps of drilling a borehole to the formation to be cored; drilling a pilot hole of smaller diameter than 525039 43 4 120 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

the core to be taken at the en'd of said borehole; positively displacing: drilling mud from said pilot hole by. positively injecting a wash liquid thereinto; positively displacing said wash liquid from said pilot hole by positively injecting a magnetic cementitious material thereinto and allowing it to .remain undisturbed until set;, and cpring ahead and removing a core sample of said formation containing a portion of said injected magnetic cementitious material; Claims allowed, 6. 6775. Method of electrical prospecting; Paul W. Klipsch, Houston, Tex.; assignor to Esme E. Rosaire, Houston, Tex.: U. S. patent 2,293,024, issued August 11, 1942. This invention relates to the method of geoelectric prospecting in which the electrical-transmission properties of the earth are measured,, comprising the steps of causing an alternating current of known ampli­ tude to flow in a region of the earth's crust; detecting and measuring the magnitude of a potential between points subjected to the flow of current; and varying the frequency of the current between such limits that the detecting and measuring step reveals the frequency range within which th'e slope of the curve of mutual impedance with respect to frequency is negative. Claims allowed, 12. 6776. Apparatus for determining permeability; George S. Bays, Tulsa, Okla., assignor to Stanolind Oil & Gas Co., Tulsa, Okla., a corporation of Dela­ ware : U. S. patent 2,293,488, issued August 18, 1942. This invention relates to an apparatus for determining the permeabil­ ity of an earth formation comprising a sample-receiving chamber; means for introducing a liquid into said chamber; means for shutting off com­ munication between said chamber and the atmosphere; means for sub­ jecting said liquid to a constant elevated pressure; and means for measuring the time required to introduce a predetermined volume of said liquid into said chamber at said elevated pressure. Claims al­ lowed, 7. 6777. Apparatus for submarine geophysical prospecting; Theodore B. .Pepper, Oakmont, Pa., assignor to Gulf Research & Development Co., Pittsburgh, : Pa., a corporation, of Delaware: U. S. patent 2,294,201, issued August 25, 1942. This invention relates to an apparatus for submarine geophysical prospecting, comprising in combination a casing adapted to rest sta­ tionary on the floor of bodies of water; a geophysical instrument in said casing; mounting means for the instrument so constituted as to permit tilting of the instrument with respect to the casing through an angular range adequate to permit leveling the instrument; level-re­ sponsive means in fixed relation to the instrument responsive-to de­ parture of the instrument from level in at least two angularly different planes; at least two power-operated instrument-tilting means within the casing, adapted, on actuation thereof, to tilt the instrument toward level in at least two angularly different planes; at least two control means each associated with said power-operated tilting means and with said level-responsive means and .so constituted as to cause operation of the tilting means upon departure of the level-responsive-means from level in any of the planes to the level in which it responds and to render the tilting means inoperative on attainment of level in all planes. Claims allowed, 6. ...-...: PATENTS ' 121

6778. Apparatus for submarine geophysical prospecting; Theodore B, Pepper, Oakmont, Pa., assignor to Gulf Research & Development Co., Pitts­ burgh, Pa., a corporation of Delaware: U. S. patent 2,294,202, issued August 25, 1942. In apparatus for performing measurements at the. floor, of bodies of water, a submersible watertight container adapted to contain a meas­ uring instrument; cable means attached to the container- for lowering it to the floor; a concave base for the container.constructed and ar­ ranged to define therebelow a space between the base and the floor; a suction pump associated with the container, having an inlet com­ municating with said space and an outlet delivering to the water outside the container; and power means for driving the pump. Claims allowed, 4. 6779. Oscillograph; Otto F. Ritzmann, Aspinwall, Pa., assignor to Gulf Research & Development Co., Pittsburgh, Pa., a corporation of Delaware: U. S. patent 2,294,320, issued August.25,1942. This invention relates to a frequency-selective oscillograph compris­ ing in combination an electrically actuable pair of vibratory bodies having different resonant vibratory frequencies-and arranged'to vibrate upon application of an oscillating electrical signal; circuit means for applying an oscillating electrical signal thereto, whereby one.body is caused to vibrate with amplitude having a maximum at some one fre­ quency and the other body is caused to vibrate with amplitude having a maximum at a different frequency; a deflectable light-reflecting means attached to the two bodies in such a manner that the reflecting means is subject to deflection by both bodies; a source of light-directing light toward the reflecting means; and a surface receiving a beam of light reflected from the reflecting means whereby the deflection of said beam of light at any instant is combined with the deflections of said two bodies at that instant. Claims allowed, 9. 6780. Method and apparatus for making geological explorations; Knute H. Evjen, Coudersport, Pa., assignor to Nordel Corporation: U. S. patent 2,294,395, issued September 1, 1942. This invention relates to the method of electrical prospecting which comprises passing a current having predetermined frequency through the earth; picking up the potential difference between two other points adjacent the earth's surface and lying within the field of influence of said earth current; deriving from said potential difference a measurex of the electrical characteristics of the earth in the area under investi­ gation ; and repeating the measurement at different selected frequencies below about 20 cycles per second to obtain a spectrum of the potential representing variations in characteristics of the earth's strata at various depths below the surface. Claims allowed, 17. 6781. Geomicrobiological prospecting; Robert Thomas Sanderson, Sierra Madre, Calif., assignor to Stanolind Oil & Gas Co., Tulsa, Okla., a corporation of Delaware: .U. S. patent 2,294,425, issued September 1, 1942. This invention relates to a method of prospecting, comprising analyz­ ing earth components taken from spaced survey stations for at least one indicator substance selected from the group consisting of hydrocar­ bons, hydrogen, and carbon monoxide; examining samples from sub­ stantially the same survey stations for at least one micro-organism 122 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

capable of producing said indicator substance; and comparing the results of such analysis and examination. Claims allowed, 4. 6782. Seismic surveying; Josephus O. Parr, Jr., San Antonio, Tex., assignor to Olive S. Petty, San Antonio, Tex.: U. S. patent 2,294,627, issued Septem­ ber 1, 1942. ' In a system for use in seismic surveying, the combination with a plu­ rality of seismometers of separate signal-amplifying means for each seismometer; conductors for signal energy extending between each seismometer and the amplifying means therefor; means disposed adja­ cent to each of said amplifying means and acting between the associated conductors for regulating the potential difference between said conduc­ tors resulting from unwanted alternating-current flow in said con­ ductors ; and means connecting the regulating means for different am­ plifiers, said last-named means including phase-shifting means. Claims allowed, 6. 6783. Well-survey method and apparatus; Jacob Neufeld, Tulsa, Okla., assignor to Well Surveys, Inc., Tulsa, Okla., a corporation of Delaware: U. S. patent 2,296,176, issued September 15, 1942. This invention relates to a method of geophysical prospecting that comprises separately simultaneously measuring the intensity of radio­ active radiations of a plurality of frequency ranges coming from a formation about which information is desired, and dividing one of said measurements by another in such a manner as to give a measurement indicative of the frequency x distribution of said radiations. Claims allowed, 16. INDEX TO GEOPHYSICAL ABSTRACTS 111

OCTOBER-DECEMBER 1942

[The figures in parentheses refer to the class in which the entry stands; see list in table of contents]

Abstract Abstract Alcock, E. D. (3). 6709 Ising, G. A. (10). . 6770 Arnold, J. C. (10). __ 6759 Jeffreys, Harold (3)______6712,6713 Barry, Adelbert (10)______6749 Jolliffe, A.-W. (5)______:__ 6728 Bays, G. S. (10) _ 6776 Jones, P. H. (10)______'._ 6774 Bowsky, M. C. (10) ______6760 Bullard, E. C. (5)______6726 Keevil, N. B. (5)______6728 Byerly, Perry (3) 6703 Klipsch, P. W. (10)______6775 - (9)______6738 Knouse, W. S. (10)______6746

Campbell, J. G: (10)_____ 6743,6744 Lane-Wells Co. (10)______6759,6760 Centeno-Grau, M. (9)______6739 Larsen, E. S. (5)______6728 Clewell, D. H. (1)______6697 Lawson, A. C. (1)______6699 (10)______6767 Leypoldt, Harry (3)______6714 Cloud, R. T. (10)______6771 Conclin, G. M. (5)______6727 Mayne, W. H. (10)______'_ 6752. Cooley, E. H. (10)____ 6761 McHenry, J. R. (3)______6714 Core Laboratories, Inc. (10) 6756 McKee, J. P. (8)______6734 Crites, W. J. (10)______6766 Miller, W. W. (10)______6755 Crosby, M. G. (10)-______6750 Mintou, J. P. (10)______6745

Davis, J. O. (10)______6747 National Lead Co. (10)______6746 Dobrin, M. B. (3)______6704 Neufeld, Jacob (10)____ 6761,6763,6783 Dominion Observatory (3)______6705 Neumann, Frank (9)______' 6740 Nordol Corporation (10)______6780 Eby, J. B. (3)______6706 Ennis, G. H. (10)______6758 Observatorio Nacional de Tacubaya, Evjen, K. H. (10)______6780 Mexico (2)______6702 Oil and Gas Journal (5)______6730 'Fash, R. H. (10)______6743,6744 Olson, R. W. (10)______6768 Faust, L. Y. (3).______6707 Federal'Works Agency (9)______6741 Parr, J. 0. (10)______6782 Filmer, E. A. (1)______6698 Peacock, H. B. (8)______6735 Flude, J. W. (10)______6757 Pepper, T. B. (10)______6777,6778 Freeman, L. I. (3)______6708 Petty, O. S. (10)______6752,6772,6782 Fritsch, Volker (4)______6721,6722 Phillips Petroleum Co. (10)______6766 Funk, R. V. (10)______6758 Piggot, C. S. (5) ______6729'

Gillin, J. A. (3)______6709 Radio Corporation of America (10) __ 6750 Gulf Research & Development Co. Ray, R. H. (10)______6765 (10)______6777, 6778, 6779 Richter, C. F. (3)______6710 Gutenberg, Beno (3) ______^_ -6710 Ritzmann, O. F. (10)______6779- Rosaire, E. E. (10)______6775 Hare, D. G. C. (10)______6751 Harkins, T. I. (3)______6706 Salvatori, Henry (3)______6715 Hayward, J. T. (10)______.'_ 6753,6754 Sanderson, R. T. (10) ______6781 I-Iodgson, E. .A. (3)______6711 Sawclon, W. A. (5)___"______6731 Hoover, Herbert, Jr.' (8) ______6733 Schlumberger, Marcel (10)______6764 Horner,-W. L. (10) ______6756 Schlumberger Well Surveying Corpora­ Huber, F. W. (10) ______6742 tion (10)______6742, 6764 Hughes, Henry, & Son, Ltd. (10)___ 6747 Shell Development Co. (10)______6748 123 124 GEOPHYSICAL ABSTRACTS 111, OCTOBER-DECEMBER 1942

Abstract Abstract Shock, Lorenz (3)______6709 Union Oil Co. of California (10) 6774 Shook, E. M. (10)______6768 Urry, W. D. (5)______6729 Siegert, A. J. F. (!)______6700 -Skeels, D. C. (1)______'- 6701 Wadsworth, J. (3)______6718 .Smith, R. O. (10)__,______6773 Way, H. J. R. (4)______:_____ 6723 .Socony-Vacuum Oil Co. (10)_____ 6745, Well Surveys, Inc. (10)__ 6761,6763,6783 6748, 6767, 6768 Welty/W. R. (10) ______6772 Standard Oil Development Co. (10) 6749, White, G. E. (10)______6769 6769 William Miller Corporation (10)___ 6755 Stanolind Oil & Gas Co. (10)____" 6762, 6765,6771,6776,6781 Wilson, J. H. (8)____.______6736 Stick, J. C., Jr. (5) ______6732 Wilson, J. T. (3)______6719 Stuart, R. W. (10) ___:______6762 Wolf, Alfred (4)______6724 Swan, B. G. (3)______6716 Wood, H. 0. (3)______-_____ 6720 Wood, J. T. (8)______6737 Texas Co. (10)______6751 Woods, J. P." (10)___'______6748

Ulrich, P. P. (3)_____-__-___ 6717 Zinzer, E. H. (4) 6725 INDEX TO GEOPHYSICAL ABSTRACTS 108-111 JANUARY-DECEMBER 1942

A- No. Absh Adler, J. L., Simplification of tidal corrections for gravity-meter surveys (1) 109 6500 Method and apparatus for seismic surveying, U. S. patent 2,279,191 (10) _ 110 6672 Aksentieva, Z., Results of horizontal-pendulum observations on the tides of the solid earth in Poltava (1) 109 6501 Alcock, E. D., An application of seismic surveying to the location of bauxite "1 110 6620 in Arkansas (3)__ } HI 6709 American Association of Petroleum Geologists, Origin of oil (8) 108 6443 Archie, G. E., The electrical-resistivity log as an aid in determining some reservoir characteristics (4) _ 108 6410 Arnett, R. D., Aspects of seismic curved-path computations (3) 110 6635 Arnold, J. C., Magnetic logging, U. S. patent 2,288,876 (10)__ 111 6759 Arringdale, R. L., Macroseismic study of the New Hampshire earthquake of December 1940 (3)______110 6617 Athy, L. F., Method of electromagnetic logging, U. S. patent 2,262,419 (10) __ 108 6472 Method of logging boreholes, U. S. patent 2,265,768 (10) ______108 6483 Atwill, E. R., Progress of stratigraphic studies in California (8) 109 6540

B Baker, W. L., Modern prospecting, a broad and complex science (8)_____ 108 6435 Balken, Bailey, Gravity-measuring instrument, U. S. patent 2,263,096 (10)__ 108 6473 Geophysical prospecting, U. S. patent 2,263,097 (10) __ ___ 108 6474 Barker, C. H., Carrying device for geophysical instruments, U. S. patent 2,277,505 (10)______109 6581 Barksdale; J. D., The Olympic earthquake of November 13, 1939 (3) ____ 109 6515 Barnes, Virgil, Gravitational and magnetic anomalies over a body of magnetite (1, 2) ______110 6587 Barry, Adelbert, Adjustable measuring wheel, U. S. patent 2,269,573 (10) __ 111 6749 Barth, Gustav, Method and device for determining the magnitude of magnetic fields, U. S. patent 2,252,059 (10) ______^______!____ 109 6552 Barton, D. C., The Crosbyton anomaly, southeastern Crosby County, Tex. (1)_ 110 6591 Batchelder, D. E., Alternating-current electrologging of well bores, U. S. patent 2,265,978 (10)______108 6484 Bauer, Christian, Contribution to investigations of earthquake frequency and variations in the latitude of the pole (3) ______109 6511 Bays, G. S., Apparatus for determining permeability, U. S. patent 2,293,488 (10)_ 111 6776 Beacham, C. C., Precise measurement of the electric-resistancy anomaly result­ ing from oil or gas saturation (4) ______110 6640 Beers, L. C., Radioactivity logging through casing (5) ______108 6418 Beers, Yardley, A precision method of measuring Geiger counter resolving times (5) ______1Q9 6533 Bell, A. H., Role of fundamental geological principles in the opening of the Illinois basin (8)______108 6436 Belousov, V. V., Gravitation and tectogenesis (1)______-______108 6377 Benkova, N. P., The 27-day recurrence tendency of magnetic storms (2)____ 110 6595 Berkner, L. V., Contributions of ionospheric research to geomagnetism (2)__ 10S 6H81 Bible, J. L., Geophysical-instrument mounting, U. S. patent 2,264,342 (10)_ 108 6478 Billings, M. P., Geology of the central area of the Ossipee Mountains, N. H., earthquakes (3) ______no 6615 Birch, Francis, Handbook of physical constants (9)______110 6657 Birkenhauer, H. F., The structure of the earth's crust east and north of St. Louis (3) ______109 6512 125 - 126 GEOPHYSICAL ABSTRACTS 108-111, JANUARY-DECEMBER 1942

No. Abst. Blau, L. W., Radio-wave prospecting, U. S. patent 2,268,106 (10) ______108 649a Geophysics (8)______109 6541 Process for locating valuable subterranean deposits, U. S. patent 2,269,889 (10)______^______109 6560- Seismic-electric prospecting, U. S. patent 2,269,890 (10) ______109 6561 Well-logging apparatus, Canadian patent 404,738 (10)___._____.__ 110 6694 Bodle, R. R., United States earthquakes, 1939 (9) ______108 Bolidens Gruv.akttebplag,"Ground-wave velocity-determining method, Canadian patent 400,592 (10)______:______.___ 108 6498 Bowsky, M. C., The effect of mud resistivities on the intensities of electrical logs (4)______109 652S Electrical logging in oil-filled wells, U. S. patent 2,288,884 (10) ____ 111 6760' Bradford, D. C., Geophysical education (8) ______110 6652 Brant, A. A., The present status of geophysics in Canada (8) 109 6542 Brown, S. C., Detection of radon by means of a proportional counter (5)____ 110 6642 Brunner, W., Final relative sunspot numbers for 1941 (8) __ 110 6653- Bullard, E. C., Seismic investigations on the Paleozoic floor of east England (3)_ 108 6392 - Radioactive heat generation in rocks (5)______i_ _ _ 111 6726- Bullen, K. E., The density variation of the earth's central core (1, 3) 109 6514 Burg, K. E., Prospecting method and apparatus, U. S. patent 2,265,513 (10) 108 6482: Byerly, Perry, Microseisms at Berkeley and surf on nearby coasts (3) ____ 111 6703- Seismology (9)______111 673& C Campbell, J. G., Oil-bearing-horizon detecting method, Canadian patent 402,696 (10)______109 6586- Soil-sample analysis for oil, Canadian patent 402,695 (10)______110 6692' Method of determining the petroleum-oil content of earth samples, U.S. patent 2,227,438 (10)______111 6743 Method of determining the petroleum-oil content of earth samples, U. S. patent Re- 22,081 (10)______.______111 6744 Cardsr, D. S., Seismic investigations in the Boulder Dam area in 1940 (3) __ 108 64021 Casey, S. R., Wilcox trend play at peak (8)______109 6544 Centeno-Graiii "M., Seismological studies (9)______111 6739 Chapman, Sydney, Charles Chree and his work on geomagnetism (2)______108 6382 Geomagnetic time relationships (2)______108 6383 Greenwich frequency-statistics of geomagnetic disturbance (2)______108 6384 The future of world magnetic surveying (2)______108 6385 Notes on isomngnetic charts, Part 6, Earth-air electric currents and the mutual consistency of the H and D isomagnetic charts (2) ______109 6505 Notes on isomagnetic charts, Part'7, Mathematical notes on isoporic charts and their singular points (2)- _ _ 110 6596- Notes 011 isonmgnetic charts, Part 8, The mutual consistency of the declination and horizontal-intensity isoporic charts (2) _ 110 6597 Church, J. A., Mining engineers' handbook (9)______. 108 6455 Clewell, D. H., Gravity meter, U. S. patent 2,262,165 (10) ______'.__ 108 6471 -Gravity meter, U. S. patent 2,277,509 (10)______109 6582 Gravity meter, U. S. patent 2,281,001 (10)______110 6674 Problems in temperature control of gravimeters (1) __-______111 669T Gravity meter, U. S. patent 2,290,740 (10)______111 676T Cloud, R. T., Method and apparatus for determining distances of elastic discon­ tinuities, U. S. patent 2,275,735 (10)______109 6574 Seismic-wave-velocity well logging, U. S. patent 2,275,736 (10)_____ 109 6575 Seisniic-wave-generation apparatus, U. S. patent 2,281,751 (10)_____ 110 6675 Magnetic logging, U. S. patent 2 201.692 (10) ______^_____ 111 6771 Colby, W. F., The depth dependence of earth conductivity upon surface poten­ tial data (4)______'. ______109 6529 Conclin, G. M., Gamma-ray well logging in Trinidad (5)______.- Ill 6727 Consolidated Engineering Corporation, Geophysical exploration system, \J. S. patent 2,259,478 (10)______108 6462 - Geophysical-prospecting receptor circuits, U. S. patent 2.266,040 (10) ___ 108 6485 Geophysical-prospecting receptor circuits, U. S. patent 2,2GG,O41 (1O)__ 1O8 6486 Method and apparatus for translating seismic waves, U. S. patent 2,266,837 (10)______-______108 6490 Method and apparatus for signaling, U. S. patent 2,272,201 (10)_____ 109 6565 System for making weathering corrections, U. S. patent 2,276,306 (10)_ 110 6665 Method of making weathering corrections, U. S. patent 2,276,335 (10)__ 110 6666 INDEX 127

Continental Oil Co., Method of electromagnetic logging, U. S. patent 2,262,419 No. Abst. (10) ______- - - 108 6472 Method of logging boreboles, U. S. patent 2,265,768 (10) 108 6483 Torsion gravimeter, U. S. patent, 2,279,261 (10)______-.__ 110 6673 Cooley, E. H., Well-survey method and apparatus, U. S. patent 2,288,973 (10)- 111 6761 Coombs, H. A., The Olympic earthquake of November 13, 1939 (3) ______109 6515 Core Laboratories, Inc., Apparatus for determining fluid contents of solids, U. S. patent 2,282,654 (10)______-______111 6756 Crawford, J. M., Torsion gravimeter, 2,279,261J (10) _ __ __ 110 6673 Crites, W. J., Exploration of boreholes, U. S. patent 2,290,498 (10) ______111 6766 Crosby, M. G., Frequency-modulation distance finder, U. S. patent 2,268,643 (10)______-__-______-_____-______109 6555 Limiting amplifier, U. S. patent 2,276,565 (10)______111 6750 D Dale, C. R., Thermal logging of producing oil wells (6)__ ___: _ 109 6536 Thermal logging of producing oil wells (6)______110 6648 Davis, J. O., Recording device, U. S. patent 2,268,808 (10)______111 6747 Davis, R. F., Well-surveying method and apparatus, U. S. patent 2,285,809 (10)______110 6683 Deacon, L. E., An analysis of abnormal reflections (3)______110 6616 DeGolyer, Everette, The development of the art of prospecting (8)____ 109 6543 DeLisle, J. F., On dispersion of Rayleigh waves from the North Pacific earth­ quake of November 10, 1938 (3) ______108 6393 Devlin, J. J., Macroseismic study of the New Hampshire earthquakes of De­ cember 1940 (3)______1______110 6617 Dickerson, L. W., Seismic-wave detector, U. S. patent 2,271,864 (10)_____ 109 6563 Dillon, Lyle, Process and apparatus for core-sample orientation, U. S.- patent 2,260,562 (10)______108 6465 Dix, C. H., Notes on refraction prospecting (3)______:______108 6394 Method of ^seismic surveying, U. S. patent 2,267,858 (10) ______108 6492 Dip computations below unconformities (3)______110 6618 Dobrin, M. B., An analytical method of making weathering corrections (3)_- 110 6619 An analytical method of making weathering corrections (3)___ __ 111 6704 Dominion Observatory, Earthquakes in New Zealand (3)______111 6705 Driscoll, R. L., An internal meter and its application to studies of Geiger- Miiller counter statistics (5)______108 6419 Ducloux, A. H., The importance of stratigraphic traps in petroleum geology (8) ______108 6437 E Eby, J. B., Geophysical history of Darrow dome, Ascension Parish, La. (3) __ 111 6706 Eckhardt, E. A., Method and apparatus for seismograph prospecting, U. S. patent 2,260,217 (10) ______.______108 6464 Striking expansion In geophysical operations (8) ______110 6654 Eisler, J. D., A direct-reading phase-shift meter (4) ______108 6411 Eliott, L. G., Detection of radon by means of a proportional counter (5) ____ 110 6642 Elkins, T. A., Test of a quantitative mountain-building theory by Appalachian structural dimensions (1)______- ______-______109 6502 England, C. M., A resistivity survey of the Monument oil field (4)__ __ 110 6638 Ennis, G. H., Method of and apparatus for determining the location of water strata in wells, U. S. patent 2,283,429 (10) ______111 6758 Evans, Foster, Electric and magnetic effects of cosmic rays (2, 4) __ 110 6598 Evans, R. D., Detection of radon by means of a proportional counter (5) _ 110 6642 Evinger, H. H., Current penetration in direct-current prospecting (4) ____ 108 6415 Evjen, H. M., Electrical well-logging system, U. S. patent 2,268,137 (10) __ 108 6495 Electrical well-logging system, U. S. patent 2,268,138 (10) ______108 6496 Evjen, K. H., Method and apparatus for making geological explorations, U. S. patent 2,294,395 (10)______^__ _ 111 6780 F Failing, G. F., Modern exploratory drilling equipment (3)_ _ _ __ 108 6395 Failing, T. E., Apparatus for seismic surveying, U. S. patent 2,272,741 (10)_ 109 6567 128 GEOPHYSICAL ABSTRACTS 1 08-111, JANUARY-DECEMBER 1942

Fash, R. H., Oil-bearing-horizon detecting method, Canadian patent 402,696 No. Abst. (10) ______109 6586 Soil sample analysis for oil, Canadian patent 402,695 (10)______110 6692 Method of determining the petroleum-oil content of earth samples, U. S. patent 2,227,438 (10)______111 6743 Method of determining the petroleum-oil content of earth samples, U. S. patent Re-22,081 (10) ______111 6744 Faust, L. Y., Geophysics in the Mid-Continent (3) ______111 6707 Fearon, R. E.,-Well-survey method and apparatus, U. S. patent 2,275,747 (10) _ 109 6576 Well-survey method and apparatus, U. S. patent 2,275,748 (10)_____ 109 6577 Federal Works Agency, Tables of natural logarithms (9) ______108 6458 Table of sine and cosine integrals for arguments from 10 to 100 (9)__ 111 6741 Ferguson, K. H., Wilcox trend play at peak (8)______109 6544 Filmer, E. A., Spiral springs in gravity measurement secondary twist of spiral springs in measurement of variations in value of acceleration of gravity (1)______111 6698 Fleming, J. A., Summary of the year's work to June 30, 1941, Department of Terrestrial Magnetism, Carnegie Institution of Washington (8) _____ 109 6545 Flint, R. F., Outlines of physical geology (9) ______108 6453 Flood, H. L., Mud analysis as a basis for well logging (7)______109 6537 Floyd, F. M., Measuring instrument, U. S. patent 2,258,613 (10)______108 6461 Flude, J. W., Method and apparatus for subsurface mining, U. S. patent 2,283,200 (10)______111 6757 Foyn, Ernst, The determination of radium in some igneous rocks (5) ______108 6420 Freeman, L. I., Geophysics in Canada (3) ______111 6708 Fritsch, Volker, Influence of the water content of geologic conductors upon their electrical properties (4)______111 6721 Geoelectric constitution of the subsoil and lightning protection (4) ____ 111 6722 Funk, R. V., Method of and apparatus for determining the location of water strata in wells, U. S. patent 2,283,429 (10) ______111 6758

G Galbraith, F. M., The magnetometer as a geological instrument at Sudbury (2)______110 6599 Gartlein, C. W., Aurora and geomagnetism (2) ______108 6386 Gaskell, T. F., Seismic investigations on the Paleozoic floor of east England (3) ______fl.08 6392 Gebhardt, R. E., Investigation of height of local magnetic anomaly at Port Snettisham, southeastern Alaska (2) _ _ 110 6600 Geophysical Service, Inc., Prospecting method and apparatus, U. S. patent 2,265,513 (10)______108 6482 George E. Failing Supply Co., Apparatus for seismic surveying, U. S. patent 2,272,741 (10)______109 6567 Gillin, J. A., An application of seismic surveying to the location of bauxite in) 110 6620 Arkansas (3)______/ 110 6709 Gish, 0. H., Terrestrial electricity in relation to geomagnetism (2, 4)_ 108 6387 Gleditsch, Ellen, The determination of radium in some igneous rocks (5)_ 108 6420 Goodman, Clark, Geological applications of nuclear physics (5)______110 6643 Gotsman, B., Main features of the daily magnetic variations at Cape Town (2)_ 110 6601 Guanella, Gustav, Distance-determining system, U. S'. patent 2,268,587 (10) __ 109 6553 Gulf Research & Development Co., Method and apparatus for seismograph prospecting, U. S. patent 2,260,217 (10) 108 6464 Seismograph prospecting apparatus, U. S. patent 2,263,519 (10)___ 108 6476 Apparatus for and method of seismograph recording, U. S. patent 2,267,356 (10)______- 108 6491 Seismograph, U. S. patent 2,272,984 (10) _ __.. 109 6568 Apparatus for sending and recording time impulses, U. S. patent 2,275,316 (10)______° - - 109 6572 Seismograph amplifier, U. S. patent 2,276,708 (10) ______109 6578 Apparatus for and method of seismograph prospecting, U. S. patent 2,276,709 (10)______109 6579 Apparatus for seismic prospecting, U. S. patent 2,281,949 (itf) no 6677 Apparatus for logging bores, U. S. patent 2,281,960 (10)______110 6678 Apparatus for and method of receiving and recording vibrations, U. S. patent 2,286,106 (10) _ _ __ 110 6685 INDEX 129

Gulf Research. & Development Co., Apparatus for submarine geophysical No. Abst. prospecting, U. S. patent 2,294,201 (10)______111 6777 Apparatus for submarine geophysical prospecting, U. S. patent 2,294,202 (10) ______111- 6778 Oscillograph, U. S. patent 2,294,320 (10) ______4___ 111 6779 <3urasich, S. W., Method of surveying boreholes and locating tools therein, U. S. patent 2,266,623 (10)______108 6489 Gutenberg, Beno, Mechanism of faulting in southern California indicated by seismograms (3) _ - 108 6396 Seismology (3)____ _.______T____-____ _ 110 6621 Earthquake magnitude, intensity, energy, and acceleration (3) 111 6710 H Hare, D. G. C., Method and apparatus for measuring thickness, U. S. patent 2,277,756 (10) _ ___ - - __ 111 6751 Harkins, T. I., Geophysical history of Darrow dome, Ascension Parish, La. (3)_ 111 6706 Harland, W. B., Seismic investigations on the Paleozoic floor of east England (3)__ _ _ _ - _ 108 6392 Harper, J. L., Resistivity method of locating oil and gas pays (4)_ -. 110 6639 Harradon, H. D., The variations of geomagnetism (2) ____ 110 6602 Haskell, N. A., The relation between depth, lithology, and seismic-wave velocity in Tertiary sandstones and shales (3)______108 6397 Hawkins, J. E., The results of a geophysical survey (2, 4) ______110 6603 Hawley, P. F., Logging of permeable formations traversed by wells, U. S. patent 2,281,766 (10)______110 6676 Hayes, R. C., The seismicity of New Zealand (3)______109 6516 Hayward, J. T., Detection of gas in drilling fluids, U. S. patent 2,280,075 (10) __ 111 6753 Gas detection, U. S. patent 2,280,086 (10)______111 6754 Heck, N. H., Earth motions in the vicinity of a fault slip (3)__ ___-_,. 108 6398 Earthquake history of the United States, Part 2, Stronger earthquakes of California and western Nevada (9)____-_____' -______108 6459 Heiland, C. A., Geophysical methods for the exploration and production division (8)__ '. _ 108 6438 Geophysics in war (9)______108 6451 A decimal classification system for geophysical exploration (8) ____ 109 6546 Geophysics in war (8) _ 109 6547 A rapid method for measuring the profile components of horizontal and vertical gravity gradients (!)______110 6588 Bering, Donald, Well-surveying device, U. S. patent 2,269,717 (10) __ _' 109 6559 Herrick, H. N., Method and apparatus for soil-gas analysis, U. S. patent 2,284,147. (10)______110 6679 Hersey, J. B., A method of measuring the thermal conductivity of rock cores (6)______110 6649 Hess, V. F., Radioactivity of rocks and ionization balance of the atmosphere (5) ______1 __ '_ ____ 108 6421 Higasinaka, H., Investigation of the magnetic anomalies relating to the geological structures of the Chin-lin-chen iron-ore field, North China (2)____ 108 6388 Hodge, M. W., An interval meter and its application to studies of Geiger- Miiller counter statistics (5)______108 6419 Hodgson, E. A., Velocity of elastic waves and structure of the crust in the vicinity of Ottawa, Canada (3)______:______111 6711 Honnell, P. M., Seismic-wave detector, U. S. patent 2,271,864 (10)______109 6563 Hoover, Herbert, Jr., Geophysical-prospecting receptor circuits, U. S. patent 2^266,040 (10)______108 6485 Geophysical-prospecting receptor circuits, U. S. patent 2.266,041 (10)__ 108 6486 Method and apparatus for signaling, U. S. patent 2,272,201 (10) ______109 6565 System for making weathering corrections, U. S. patent 2,276,306 (10)_ 110 6665 Contribution of geophysics to national effort (8)______111 6733 Horner, W. L., Apparatus for determining fluid contents of solids, U. S. patent 2,282,654 (10) ______111 6756 Horvitz, Leo, Geochemical prospecting, U. S. patent 2,261,764 (10)______308 6470 Geochemical well-logging method, Canadian patent 399,868 (10)_____ 108 6497 Geochemical prospecting, U. S. patent 2,270,299 (10) ____^______109 6562 The sedimentary hydrocarbon survey of the Washburn ranch oil field, La Salle County, Tex. (7) ______110 6650 Geochemical prospecting, U. S. patent 2,278,929 -(10)______110 6671 Means and methods for analysis, U. S. patent 2,287,101 (10)______110 6688 Geochemical well-logging method, Canadian patent 404,298 (10)______110 6693 130 GEOPHYSICAL ABSTRACTS 108-111, JANUARY-DECEMBER 1942

Howard, G. M., Method of and means for determining the velocity of propaga- No. Abst. tion of waves through subsurface formations, U. S. patent 2,276,974 (10) _ 109 6580 Howell, L. G., Gamma-ray well logging, U. S. patent 2,288,278 (10) 110 6690 Huber, Fs W., Method of and apparatus for electrically exploring earth for­ mations, U. S. patent Re-21,832 (10) ______111 6742 Hughes, D. S., The analytic basis of gravity interpretation (1) 110 6589 Hughes, Henry, & Son, Ltd., Recording device, U. S. patent 2,268,808 (10)__ 111 6747 Hughes, R. F., Method of logging boreholes, U. S. patent 2,265,768 (10) 108 6483

I

International oil (editorial), Geochemical laboratory goes to the field (7) 108 6430 Ishkov, P. K., On the propagation of electric waves within- a stratum overly­ ing a hard foundation (3) _ . 108 6399 Ising, G. A., Apparatus for relative gravity measurements, U. S. patent 2,291,- 628 (10) ______-__-____ ' HI 6770

J

Jeffreys, Harold, The thermal state of the earth (6) 108 6429 On the radioactivities of rocks (2d paper) (5) _ 110 6644 The times of sP and sPKP (3) ______111 6712 The deep earthquake of 1934, June 29 (3)__ 111 6713 Jenny, W. P., Micromagnetic prospecting device, U. S. patent 2,261,030 (10)__ 108 6466 Micromagnetic surveys in the Sparta-Wilcox trend of Texas and Lou­ isiana (2)______110 6604 Jessen, F. W., Well logging, U. S. patent 2,269,269 (10)______109 6557 Johnson, C. H., Method of determining where pipe is stuck in a' \vell, U. S. patent 2,277,110 (10) _____-__-______-__ 110 6668 Jolliffe, A. W., The distribution of helium and radioactivity in rocks helium- age investigations of diabase and granodiorites from Yellowknife, North­ west Territory, Canada (5)______111 6728 Jones, J. H., A proposed method of measuring the derivatives of the earth's magnetic field (2)______110 6605 Jones, P. H., Method and apparatus for imparting directional" magnetic prop­ erties to core samples, U. S. patent 2,292,838 (10)______111 6774 Jung, D. A., Marine sedimentation and oil accumulation on the Gulf coast, part I, Progressive marine overlap (4) ______108 6414

K Kannenstine, F. M., Method and apparatus for recording waves, U. S. patent 2,257,859 (10)______108 6460 Measuring instrument, U. S. patent 2,258,613- (10) ______108 6461 Method and apparatus for seismic surveying, U. S. patent 2,279,191 (10)_ 110 6672 Karcher, J. C., Apparatus for analyzing gases, U. S. patent 2,261,498 (10) __ 108 6468 Kaufman, J. M. S., Electrical-prospecting apparatus, U. S. patent 2,274,903 (10) ______109 6571 Keck, W. G., The depth dependence of earth conductivity upon surface poten­ tial data (4) ______109 6529 Keevil, N. B., Radioactive aureoles around svome ore deposits (5)______]_ 108 6422 The distribution of helium and radioactivity in rocks Mineral separates from the Cape Ann granite (5)______108 6423 The distribution of helium and radioactivity in rocks (5) ______- 109 6534 The distribution of heliunji and radioactivity in rocks helium-age investi­ gations of diabase and granodiorites from Yellowknife, Northwest Territo­ ry, Canada (5)______111 6728 Keiier, Fred, Jr., Geoelectric investigations over Penn's Cave (4) ______108 6412 Kelly, S. F., Summary of reports by committee on geophysics education, Mineral Industry Education Division (8)______108 6439 Integration of geology, physics, and chemistry for the solution of earth problems (8)______:______- no 6655 Kelly, w. A., Method of locating oil deposits, U. S. patent 2,266,556 (10)___ 108 6488 Kerr-Grant, c., Seismic investigations on the Paleozoic floor of east England (3) ______' 108 6392 Klips'ch, P. W., Method of electrical prospecting, U. S. patent 2,293,024 (10) __ 111 6775 Klotz, R. L., Seismic shooting near power lines (3)______110 6622 INDEX ' 131

No. Abst. Knapp, D. G., The new isogonic chart of the United States (2) 109 6506 Knopf, Adolf, Outlines of physical geology (9)__ ___ 108 6453 Knouse, W. S., Apparatus for surveying deep wells, U. S. patent 2,268,256 (10)_ 111 6746 Kolhb'rster, Werner, The tube counter as a measuring instrument (5) 108 6424 Krasnow, Shelley, Electrical-prospecting apparatus, U. S. patent 2,274,903 (10)______-______-__ 109 6571 Krumbein, W. C., Criteria for subsurface recognition of unconformities (8)___ 108 6440 Principles of sedimentation and the search for stratigraphic traps (8) 108" 6441 Kutscher, Fritz, Geomagnetic investigations on pyrites deposits in the southern Riesengebirge (2)______110 6606 Measurements of earth magnetism in the magnetite deposits of the south­ ern Riesengebirge (2)______110 6607 L Landsberg, Hans, Geoelectric investigation over Penn's Cave (4) 108 6412 Lane-Wells Co., Alternating-current electrologging of well bores, U. S. patent 2,265,978 (10)______108 6484 Magneic logging, U. S. patent 2,288,876 (10)______111 6759 Electrical logging in oil-filled wells, U. S. patent 2,288,884 (10)___ 111 6760 Langguth, L. C., Macroseismic study of New Hampshire earthquake of December 1940 (3)______110 6617 Larsen, E. S., The distribution of helium and radioactivity in rocks (5) 109 6534 The distribution of helium and radioactivity in rocks helium-age investi­ gations of diabase and granodiorites from Yellowknife, Northwest Territory, Canada (5)______-______-____ 111 6728 Lawrence, R. W., Basic research on explosives (3)_:______110 6623 Lawson, A. C., Mississippi delta a study in isostasy (1)______111 6699 Lee, F. W., Geophysical surveying, U. S. patent 2,264,318 (10)______108 6477 Electrical impedisivity or resistivity measuring, U. S. patent 2,277,707 (10) -__-______-______109 6583 Leet, L. D., Trial traveltimes for northeastern America (3)______108 6400 Earthquakes of the northeastern United States and eastern Canada, 1938, 1939, 1940 (3)______109 6518 Instrumental study of the New Hampshire earthquakes of December 1940 (3) ______110 6624 Levorsen, A. I., Trends in petroleum geology (8) ______108 6442 The origin of oil (9)______'______108 6452 Possible future oil provinces of the United States and Canada (9)_____ 108 6457 Stratigraphic-type oil fields (9)______109 6551 Leypoldt, Harry, Sea-level changes as trigger forces (3) ___ 109 6517 Block pattern of crustal movements in Long Beach (3) ______111 6714 Lindsey, R. W., Reflected refractions (3)______109 6522 Linehan, Daniel, Earthquakes of the northeastern United States and eastern Canada, 1938, 1939, 1940 (3)______109 6518 Instrumental study of the New Hampshire earthquakes of December 1940 (3)______110 6624 Lipson, Edward, Method for electrical investigation of cased drill holes, U. S. patent 2,273,363 (10)______110 6664 Longacre, W. A., A study of the problem of depth determination by means of earth-resistivity measurements (4)______108 6413 Longwell, C. F., Outlines of physical geology (9)_ _ _ _ 108 6453 Ludy, A. K., Earthquake notes (9) ______100 6550 Earthquakes notes (9)______110 6658 Lundberg Exploration S. A., Apparatus for geophysical prospecting, U. S. patent 2,278,506 (10)______-______110 6670 Apparatus for geoelectric and seismic investigations, U. S. patent 2,288,310 (10) ______110 6691 Lundberg, H. T. F., Geophysical-exploration apparatus, Canadian patent 402,212 (10) ______109 6584 Lundberg, Hans, Ltd., Geophysical-exploration apparatus, Canadian patent 402,212 (10) ______109 6584 Geophysical-exploration method, Canadian patent 402,526 (10)______109 6585 M Malkin, D. S., Marine sedimentation and oil accumulation on the Gulf coast, Part I, Progressive marine overlap (4)______108 6414 132 GEOPHYSICAL ABSTRACTS 108-111, JANUARY-DECEMBER 1942

Malmquist, J. D., Ground-wave velocity-determining method, Canadian patent No. Abst. 400,592 (10)______-______-___ 108 6498 Mantle, Edward, Amateur seismology in the making (3)_____: __ _ 109 6510 Marchand, J. A., Gravity-measuring instrument, U. S. patent 2,263,096 (10)___ 108 6473 Geophysical prospecting, U. S. patent 2,263,097 (10)______108 6474 Marsch, B., Electrical measurements in physical soil research (3, 4)_ _ 103 6401 Matthews, N. W., Auxiliary electrode for ground-resistance measurements, U. S. patent 2,270,325 (10)______110 6663 Mayne, W. H., Oscillograph, U. S. patent 2,279,124 (10)--______111 6752 McAfee, J. C., Spiralok a new shell for seismic shooting (3)______lib 6625 McCarty, Malcolm, Timing device, U. S. patent 2,277,521 (10) __ 110 6669 McCollum, E. V., Gravity expression of the Hatchetigbee anticline (1)_ 110 6590 McComb, H. E., Geophysical measurements in the laboratory and in the field ' (2, 3)___..______109 6507 McCready, H. J., The gravity meter in Colombia (1)______-______108 6378 McHenry, J. R., Block pattern of crustal movements in Long Beach (3) ____ 111 6714 McKee, J. P., Application of time logs to porosity studies in central Kansas wells (8) _ ___-_--___-______. __ 111 6734 McLemore, E. W., The Crosbyton anomaly, southeastern Crosby County, Tex. (1) ______110 6591 McNamee, B. F., Method and apparatus for logging boreholes, U. S. patent 2,259,904 (10)______108 6463 McNish, A. G., Significance of fossil magnetism (2) ______108 6389 Mead, T. C., Seismic investigations in the Boulder Dam area in 1940 (3) ____ 108 6402 Meinzer, O. E., Hydrology (9)______110 6659 Merritt, J. W., Advanced geochemical well-logging (7)______109 6538 Metcalf, D. P., A study of electrical earth noise (4)______109 6530 Miller, W. J., Introduction to physical geology, with special reference to North America (9)__-___'.______108 6454 Miller, W. W., Galvanometer, U. S. patent 2,282,590 (10)______111 6755 Minakami, Takesi, Minor activity of Volcano Sakurazima in October 1939 (3)_ 110 6634 Minton, J. P., Gain control for seismograph amplifiers, U. S. patent 2,265,538 (10) ______111 6745 Morgan, C. G., A new seismograph drill (3)______108 6403 Geophysical exploration system, U. S. patent 2,259,478 (10)______108 6462 Mott-Smith, L. M., Curved-path methods applied to vertical and to wide-shot spreads (3)______110 6626 Mounce, W. D., Method and apparatus for coring, U. S. patent 2,264,449 (10) 108 6479 Gun perforator, U. S. patent 2,264,450 (10)______108 6480 Muffly, Gary, Method and apparatus for seismograph prospecting, U. S. patent 2,260,217 (10)______108 6464 Mukherji, S. M., The Hindu Kush earthquake of November 21, 1939 (3)_____ 109 6520 Muskat, Morris, Current penetration in direct-current prospecting (4)_____ 108 6415

N Nasu, Nobuji, Studies on the propagation of an artificial earthquake wave through superficial soil or sand layers, and the elasticity of soil and sand (3)_ 110 6627 National Lead Co., Apparatus for surveying deep wells, U. S. patent 2,268,256 (10) ______111 6746 Nature (editorial), British Association Seismological Committee (3) ______109 6513 Nettleton, L.. L., Gravity and magnetic calculations (1, 2)______110 6592 Neuenschwander, E. F., A study of electrical earth noise (4)______109 6530 Neufeld, Jacob, Well-surveying method and apparatus, U. S. patent 2,273,215 (10) ______109 6569 Well-surveying method, U. S. patent 2,274,248 (10) ______109 6570 Method and .apparatus for radioactive investigation of drill holes, U. S. patent 2,275,456 (10) ______109 6573 Well-survey method and apparatus, U. S. patent 2,288,973 (10)___«__ 111 6761 Well-survey method and apparatus, U. S. patent 2,289,926 (10)__ 111 6763 Well-survey method and apparatus, U. S. patent 2,296,176 (10) _ 111 6783 Neumann, Frank, Earth motions in the vicinity of a fault slip (3)__ ___ 108 ' 6398 United States earthquakes, 1940 (9)______111 6740 Newton, W. M., Jr., Factors influencing electrical resistivity of drilling fluids (4)______109 6532 Nisle, R. G., Considerations on the vertical migration of gases (7)______108 6431 Nordel Corporation, Method and apparatus for making geological explorations, U. S. patent 2,294,395 (10) ______111 6780 INDEX 133

0 ' No. Abst. Observatorio Nacional de Tacubaya, Mexico, Universidad Nacional, Seccion Magnetica, 1942 (2)______.______111 6702 Oil and Gas Journal (editorial), Radioactivity logging proves help in rework­ ing old wells (5) ______111 6730 Oil Weekly (editorial), Advancements continue to be made in geophysical field (8) ______108 6434 Olson, R. W., Geophysical instrument, U. S. patent 2,264,596 (10) ______108 6481 Electric seismograph, U. S. patent 2,290,773 (10) ______='_ 111 6768 P Parr, J. 0., Seismic surveying, U. S. patent 2,286,567 (10)______110 6687 Seismic surveying, U. S. patent 2,294,627 (10)______111 6782 Parsons, C. P., Caliper logging in the Southwest (4)______109 6531 Peacock, H. B., How can geophysicists best serve? (8)______111 6735 Pearson, J. M., Electrical-prospecting method and apparatus, U. S. patent 2,271,951 (10);______-______109 6564 Core-orienting apparatus, Canadian patent 405,970 (10)______110 6696 Peele, Robert, Mining engineer's handbook (9) ______108 6455 Pepper, T. B., Apparatus for submarine geophysical prospecting, U. S. patent 2,294,201 (10)______:______111 6777 Apparatus for submarine geophysical prospecting, U. S. patent 2,294,202 (10) ______111 6778 Peterson, R. A., Method of making weathering corrections, U. S. patent 2,276,335 (10) _ - _ _; ______110 6666 Petty, 0. S., Method and apparatus for seismic surveying, U. S. patent 2,285,610 (10)______110 6682 Seismic surveying, U. S. patent 2,286,567 (10)______110 6687 r- Oscillograph, U. S. patent 2,279,124 (10) ______^______111 6752 Geophysical apparatus and method, U. S. patent 2,291,779 (10)____ 111 6772 Seismic surveying, U. S. patent 2,294,627 (10)______111 6782 Phelan, S. R., Geophysical prospecting (8)______108 6444 Phillips Petroleum Co., Well-surveying device, U. S. patent 2,266,071 (10) __ 108 6487 Exploration of boreholes, U. S. patent 2,290,408 (10)___1______111 6766 Piety, R.G., Well-surveying device, U. S. patent 2,266,071 (10)______108 6487 Interpretation of the transient behavior of the reflection seismograph (3)_ 110 6628 Piggot, C. S., Radioactivity of ocean sediments The radium content of sediment of the Cayman Trough (5)______108 6425 Radioactivity of ocean sediments Concentrations of the radio elements and their significance in red clay (5)______108 6428 Time relations in ocean sediments (5) ______111 6729 Pillai, A. R., The Hindu Kush earthquake of November 21, 1939 (3) __,___ 109 6520 Pirson, S. J., Recent developments and successes in geodynamic prospecting (7)_ 108 643i! Theoretical and economic significance of geodynamic prospecting (7)_ 109 6539 Poldini, B.'M., Electrical exploration of the subsoil (9)______108 6456 Some results of electrical prospecting (9) _ - _ .'__ _ _ - 110 6660 Pontecorvo, Bruno, Radioactivity analyses o'f oil-well samples (5) 109 6535 Prescott, H. R., Method of electromagnetic logging, U. S. patent 2,262,419 (10) _ 108 6472 Method of logging boreholes, U. S. patent 2,265,768 (10) ______108 6483 Torsion gravimeter, U. S. patent 2,279,261 (10) ______- 110 6673 Puzicha, Kurt, The magnetism of rocks as a function of their magnetite content (2)______:______110 6608 Q Quitzow, H. W., Modern investigations of the iron deposits of the Niedere Gesenke (2)______-______110 6609 R Radio Corporation of America, Frequency-modulation distance finder, U. S. patent 2,268,643 (10) ______109 6555 Limiting amplifier, U. S. patent 2,276,565 (10)__.______111 6750 Radio Patents Corporation, Distance-determining system, U. S. patent 2,268,587 (10)______-______'109 6553 Randell, J. T., Some theoretical and practical magnetometric comparisons (2) 108' 6390 Ray, R. H., Geophysical-instrument mounting, U. S. patent 2,290,354 (10) 111 6765 134 GEOPHYSICAL ABSTRACTS 108-111, JANUARY-DECEMBER 1942

Rayner, J. M.. Examination of the Henbury meteorite craters by the methods No. Abst. of applied geophysics (2) ______108 6391 Reich, Hermann, The natural magnetization of rocks on the basis of measure­ ments of drill cuttings (2)______110 6610 Richter, C. P., Earthquake near Whittier, Calif., January 29, 1941 - 109 6521 Earthquake magnitude, intensity, energy, and acceleration (3) _ 111 6710 Richer, Frank, -Method and apparatus for logging boreholes, U. S. patent 2,259,904 (10)______- 108 6463 System for measuring earth conductivity, U. S. patent 2,261,563 (10) 108 6469 Ritzmann, 0. F., Seismograph prospecting apparatus, U. S. patent 2,263,519 (10)______-______-__ 108 6476 Apparatus for and method of seismograph recording, TJ. S. patent 2,267,356 (10)______- 108 6491 Seismograph, U. S. patent 2,272,984 (10)______109 6568 Apparatus for sending and recording, time impulses, U. S. patent 2,275,316 (10)______109 6572 Apparatus for seismograph prospecting, TJ. S. patent 2,281,949 (10) 110 6677 Apparatus for and method of receiving and recording vibrations, U. S. patent 2,286,106 (10)______' HO 6685 Oscillograph, U. S. patent 2,294,320 (10) __ _ HI 6779 Robert, K. Q., Carrying device for geophysical instruments, U. S. patent 2,277,505 (10)______-__ - - '109 6581 Romberg, Frederick, The probable errors of delta-T velocities (3) 108 6404 Gravitational and magnetic anomalies over a body of magnetite (1, 2) 110 6587 Rosaire, E. E., Discovery trends indicate new prospecting (7) _ _ __ 108 6433 Prospecting effectiveness (8)______108 6445 Method and apparatus for recording waves, U. S. patent 2,257,859 (10) _ 108 6460 Geochemical prospecting, U. S. patent 2,261,764 (10)______108 6470 Prospecting tactics in a total-war economy (8)__ _ _ 109 6548 Geochemical prospecting, U. S. patent 2,270,299 (10)______109 6562 Geochemical prospecting, U. S. patent 2,272,645 (10)______109 6566 The sedimentary hydrocarbon survey of the Washburn ranch oil field, LaSalle County, Tex. (7)______-______110 6650 Geochemical prospecting, TJ. S. patent 2,278,929 (10)______»._____ 110 6671 Means and method for analysis, TJ. S. patent 2,287,101 (10)______110 6688 Geochemical well-logging method, Canadian patent 404,298 (10)____ 110 6693 -Method of electrical prospecting, U. S. patent 2,293,024 (10)______111 6775 Rose, R. B., Radioactive exploration (5)______108 6426 Rosenquist, I. T., The determination of radium in some igneous rocks (5)__ 108 6420 Ruark, A., An interval meter and its application to studies of Geiger-Muller counter statistics (5)______-______108 6419 Russell, W. L., Development of radioactivity well logging through casing (5)_ 108 6427 S Salvatori, Henry, Geophysics on the Pacific coast (3)______111 6715 Sanderson, R. T., Geomicrobiological prospecting, U. S. patent 2,294,425 (10) _ 111 6781 Sawdon, W. A., Orientation of conventionally ^recovered cores (2) ______109 6508 Locating cased-off productive zones (5)_-______111 6731. Schaeffer, H. C., System for making weathering corrections, U. S. patent 2,276,306 (10)______110 6665 Scherbatskoy, S. A., Well-survey apparatus, Canadian patent 401,688 (10)__ 108 6499 Well-surveying method, U. S. patent 2,274,248 (10) ______'____ 109 6570 Well-survey method and apparatus, U. S. patent 2,285,840 (10)_____ 110 6684 Schlesman, C. H., Method and apparatus for geophysical prospecting, U. S. patent 2,284,345 (10)______110 6680 Schlumberger, Marcel, Method and apparatus for electrical prospecting, U. S. patent 2,284,990 (10)______110 6681 Core-taking projectile, U. S. patent 2,288,210 (10)______110 6689 : Thermal process and device for surveying the beds traversed by drill holes, U. S. patent 2,290,075 (10) ______111 6764 Schlumberger Well Surveying Corporation, Method of and apparatus for elec­ trically exploring earth formations, U. S. patent Re-21,832 (10) ____1 111 6742 Thermal process and device for surveying the beds traversed by drill holes, U. S. patent 2,290,075 (10)______111 6764 Seth, I. D., Reflection and refraction of attenuated waves in semi-infinite elastic solid media (3)______108 6405 Shairer, J. F., Handbook of physical constants (9)______110 6657 INDEX . 135

No. Abst. Sharpe, J. A., The effect of charge size on reflection records (3)____ 110 6629 The production of elastic waves by explosion pressures, Part 1, Theory and empirical field observations ; part 2, Results of observations near an exploding charge (3)__.______- 110 6630 Shaw, S. H., Nomograms for determining apparent dips (8) _ 108 6446 Sheffet, David, Note on the transmission of radio waves through the earth (5)______-______-______110 " 6645 Shell Development Co., Electrical well-logging system, U. S. patent 2,268,137 (10)______-___-__-____ - 108i 6495 Electrical well-logging system, U. S. patent 2,268.138 (10) ______108 6496 Seismograph-amplitude control, Canadian patent 405,035 (10)___ 110 6695. - Multiple-recording galvanometer, U. S. patent 2,269,414 (10) 111 6748 Sherborne, J. E., Factors influencing electrical resistivity of drilling fluids (4)_ 109 6532 Sherman, K. L., Comparison of methods for computing air-earth current (2) 110 6611. Shock, Lorenz, An application of seismic surveying to the location of bauxite ( 110 6620 in Arkansas (3) _ _ {ill 67Q9 Shook, E. M., Geophysical instrument, U. S. patent 2,264,596 (10) _ __ 108 6481 Electric seismograph, U. S. patent 2,290,773 (10)______111 6768 Siegert, A. J. F., Determination of the Bouguer correction constant (1) 109 6503 An instrument for the computation of gravity anomalies (1) _ 110 6593 A mechanical integrator for the computation of gravity anomalies (1) 111 6700 Siemens Apparate und MascMnen Gesellschaft m. b. H., Method and device for determining the magnitude of magnetic fields, U. S. patent 2,252,059 ( 10) _ 109 6552 Silverman, Daniel, Geophysical-instrument mounting, U. S. patent 2,264,342 (10) __ -______-__-______108' 6478 Well logging, U. S. patent 2,268,627 (10)______109 6554 Note on the transmission of radio waves through the earth (5) __ _ 110 6645 Recording system, U. S. patent 2,276,423 (10)___-______110 6667 Seismometer, U. S. patent 2,286,386 (10)______110 6686 Skeels, D. C., The value of quantitative interpretation of gravity data (1) __- 110 6594 The value of quantitative interpretation of gravity data (1)__ ___ 111 6701 Skeeters, W. W., Gravity work in Illinois (1)______-______108 6379 Slotnick, M. M., Method of geophysical investigation, U. S. patent 2,268,130 (10) ______108 6494 Smith, G. A., Electrical-prospecting method and apparatus, U. S. patent 2,271,951 (10)______'______109 .6564 Smith, R. O., Photochemical exploration method, U. S. patent 2,292,300 (10) 111 6773 Socony-Vacuum Oil Co., Inc., Gravity meter, U. S. patent 2,262,165 (10)____ 108 6471 Geophysical instrument, U. S. patent 2,264,596 (10)______108 6481 Method of seismic surveying, U. S. patent 2,267,858 (10)______108 6492 Carrying device for geophysical instruments, U. S. patent 2,277,505 (10) _ 109 6581 Gravity meter, U. S. patent 2,277,509 (10)______109 6582 - Timing device, U. S. patent 2,277,521 (10)______110 6669 Gravity meter, U. S. patent 2,281,001 (10) ______110 6674 Method and apparatus for geophysical prospecting, U. S. patent 2,284,345 (10) ______110 6680 Gain control for seismograph amplifiers, U. S. patent 2,265,538 (10)__ 111 6745 Gravity meter, U. S. patent 2,290,740 (10)______111 6767- Electric seismograph, U. S. patent 2,290,773 (10) ______111 6768 Sparks, N. R., A note on a rationalized velocity-depth equation (3) _-______110 6631 Sperry-Sun Well Surveying Co., Method of surveying boreholes and locating tools therein, U. S. patent 2,266,623 (10)______108 6489 Well-surveying instrument, U. S. patent 2,268,682 (10) ______109 6556 Well-surveying device, U. S. patent 2,269,717 (10)______109 6559 Electrical-prospecting method and apparatus, TJ. S. patent 2,271,951 (10) _ 109 6564 Core-orienting apparatus, Canadian patent 405,970 (10)______110 6696 Spicer, H. C., Handbook of physical constants (9)______..______110 6657 Earth resistivity as applied to problems of exploration in the. potash- bearing region near Carlsbad, N.'Mex. (4)______108 6416' Standard Oil & Gas Co., Logging of permeable formations traversed by wells, U. S. patent 2,281,766 (10)______110 6676 Seismometer, U. S. patent 2,286,386 (10)______110 6686 Standard Oil Co. of California, Method and apparatus for soil-gas analysis, ' U. S. patent 2,284,147 (10)______110 6679 136 GEOPHYSICAL ABSTRACTS 108-111, JANUARY-DECEMBER 1942

Standard Oil Development Co., Seismic exploration method, U. S. patent No. Abst 2,261,321 (10)______108 6467 Method and apparatus for coring, U. S. patent 2,264,449 (10) _ . 108 6479 Gun perforator, U. S. patent 2,264,450 (10)______108 6480 Radio wave prospecting, U. S. patent 2,268,106 (10) ____ 108 6493 Metbod of geophysical investigation, U. S. patent 2,268,130 (10)_ 108 6494 Geochemical well-logging method, Canadian patent 399,868 (10) .108 6497 Well logging, U. S. patent 2,269,269 (10)______109 6557 Process of analysis of core samples containing oil and water, U. S. patent 2,269,569 (10) ______109 6558' Process of locating valuable subterranean deposits, U. S. patent 2,269,889 (10). Seismic-electric prospecting, U. S. patent 2,269,890 (10)______Gamma-ray well logging, U. S. patent 2,288,278 (10) ______Geochemical well-logging method, Canadian patent 404,298 (10)____ Well-logging apparatus, Canadian patent 404,738 (10)______Adjustable measuring wheel, U. S. patent 2,269,573 (10) ______- Geophysical prospecting, U. S. patent 2,291,596 (10)______Stanolind Oil & Gas Co., Logging wells during drilling, U. S. patent 2,263,108 (10) __ _ _ _ 108 6475 Geophysical-instrument mounting, U. S. patent 2,264,342 (10)_____ 108 6478 Well logging, U. S. patent 2,268,627 (10)______109 6554 Method and apparatus for determining distances of elastic discontinuities, U. S. patent 2,275,735 (10)______109 6574 Seismic-wave-velocity well logging, U. S. patent 2,275,736 (10)_____ 109 6575 Recording system, U. S. patent 2,276,423 (10) ______110 6667 Scismic-wave-generation apparatus, U. S. patent 2,281,751 (10)_____ 110 6675 Method and apparatus for logging wells, U. S. patent 2,289,687 (10)___ 111 6762 Geophysical-instrument mounting, U. S. patent 2,290,354 (10)______111 6765 Magnetic logging, U. S. patent 2,291,692 (10)______111 6771 Apparatus for determining permeability, U. S. patent 2,293,488 (10) __ 111 6776 Geomicrobiological prospecting, U. S. patent 2,294,425 (10)_ __ __ 111 6781 Steele, W. E., Jr., Comparison of well surveys and reflection "time-delta time" velocities (3)______108 6406 Stick, J. C., Jr., Radioactivity logging in California (5) ______111 6732 Stommel, H. E., The results of a geophysical survey (2)______110 6603 Stuart, R. W., Logging wells during drilling, U. S. patent 2,263,108 (10) ___ 108 6475 Method and apparatus for logging wells, U. S. patent 2,289,687 (10)____ 111 6762 Stulken, E. J., Seismic velocities in the southeastern San Joaquin Valley of California (3)______108 6407 Stumpff, K., Determination and reality of periodicities Calculation of correla­ tions (9)______Sulkowski, E. L., The cut-off bias principle in automatic time recording (3) Swan, B. G., Areal distribution of velocities in the Texas Gulf coast (3)____ Local areal distribution of velocities in the Texas Gulf coast (3) _ __ Swanson, C. O., The use of the dip needle in mapping structure (2)______Swartz, C. A., Reflected refractions (3) ______Seismograph evidence regarding the depth of the salt in the salt-dome province of southern Mississippi (3)______110 6633

T

Tarbet, L. A., Geology of Del Valle oil field, Los Angeles County, Calif. (8)___ 109 6549 Tavolini, Altiero, Determination of the density and temperature coefficients of the gravimetrical pendulum "Mioni" of the Geophysical Institute of the Royal University of Naples (!)______109 6504 Taylor, M. D., Critical review of methods-for the determination of the porosity, permeability, and saturation of core, samples (8) _ 108 6447 Texas Co., Seismic-wave detector, U. S. patent 2,271,864 (10) ______109 6563 Method and apparatus for measuring thickness, U. S. patent 2,277,756 (10) ______111 6751 Thoenen, J. R., Seismic effect on quarry blasting (3) 109 6523 Thompson, R. R., Well-logging apparatus, Canadian patent 404,738 (10)______110 6694 Tsuya, H., Minor activity Of Volcano Sakurazima in October 1939 (3) ______110 6634 Tullis, E. L., Magnetometer surveys during 1941 (2) ______109 6510 Twenhofel, W. H., Methods of study of sediments (9)______110 6662 Tyler, S. A., Methods of study of sediments (9)______110 6662 INDEX 137

tJ No. Abst.

Ulrich, F. P., Progress report for 1940 of the United States Coast and Geodetic Survey in the western United States (3)______: __ _ 108 6409 Progress report of the seismological work by the United States Coast and Geodetic Survey in the western United States during 1941 (3) _ 111 6717 Union Oil Co. of California, Process and apparatus for core-sample orientation, U. S. patent 2,260,562 (10)______108 6465 Method and apparatus for imparting directional magnetic properties to core samples, U. S. patent 2,292,838 (10)______111 6774 Urry, W. D., Radioactivity of ocean sediments The radium content o'f sedi­ ments of the Cayman Trough (5) ______108 6425 Radioactivity of ocean sediments Concentrations of the radio elements and their significance in red clay (5) ______108 6428 The radio elements in nonequilibrium systems (5)______110 6646 Time relations in ocean sediments (5) ______111 6729 V Vacquier, V. V., Apparatus for logging bores, U. S. patent 2,281,960 (10) __ 110 6678 van Wijk, A. M., Adjustment of horizontal-intensity and declination variom­ eters at the magnetic observatory, Hermanns (2)______110 6612 Vestine, E. H., The reduction of magnetic observations to epoch (2)__ __ 110 6613 W Wadsworth, J., The Wiechert vertical seismograph an improved design (3)_ 111 6718 Walter, E. J., Local earthquakes and crustal layering immediately south of St. Louis (3)______-______1_____ 109 6524 Wantland, Dart, The doodlebug versus applied geophysics (8) ______108 6448 Magnetic interpretation (2)______110 6614 Waters, K. H., Aspects of seismic curved-path computations (3) 110 6635 Way, H. J. R., An analysis of the results of prospecting for water in the Uganda by the resistivity method (4)______111 6723 Weaver, Paul, The aid of geophysics to geology in finding oil fields (8) __ 108 6449 The Crosbyton anomaly, southeastern Crosby County, Tex. (1)______110 6591 A theory of the distribution of radioactivity in marine sedimentary rocks (5)______110 6647 The relative place of empirical and analytic methods of geophysical interpretation (8)______110 6656 Webb, E. R., Well-surveying instrument, U. S. patent 2,268,682 (10)__ 109 6556 Weber, E., The tube counter as a measuring instrument (5)______:__ 108 6424 Well Surveys, Inc., Well-survey apparatus, Canadian patent 401,688 (10)___ 108 6499 Well-surveying method and apparatus, U. S. patent 2,273,215 (10)___ 109 6569 Well-surveying method, U. S. patent 2,274,248 (10)______109 6570 Method and apparatus for radioactive investigation of drill holes, U. S. patent 2,275,456 (10)______1______109 -6573 Well-survey method and apparatus, U. S. patent 2,275,747 (10) _ 109 6576 Well-survey method and apparatus, U. S. patent 2,275,748 (10)_____ 109 6577 Well-surveying method and apparatus, U. S. patent 2,285,809 (10) ___ HO 6683 Well-survey method and apparatus, U. S. patent 2,285,840 (10) 110 6684 Well-survey method and apparatus, U. S. patent 2,288,973 (10)__ _ HI 6761 Well-survey method and apparatus, U.'S. patent 2,289,926 (10)____ _ 111 6763 Well-survey method and apparatus, U. S. patent 2,296,176 (10) ______111 6783 Welty, W. R., Geophysical apparatus and method, U. S. patent 2,291,779 (10) 111 6772 West, T. S., Precise measurement of the electrical-resistivity anomaly resulting from oil or gas saturation (4)______110 6640 White, G. E., Further advances in prospecting by electric transients (4)_ 108 6417 Geophysical prospecting, U. S. patent 2,291,596 (10)______111 6769 Wiley, H. F., Method and apparatus for translating seismic waves, U. S. patent 2,266,837 (10)______-___ 108 6490 William Miller Corporation, Galvanometer, U. S. patent 2,282,590 (10)____ 111 6755 Williams, J. S., The Oldham seismograph station at Utah State Agricultural College, Logan, Utah (3)______109 6525 Williams, Milton, Process for analysis of core samples containing oil and water, U. S. patent 2,269,569 (10)______:______109 6558 Williams, P. S., Seismic exploration method, U. S. patent 2,261,321 (10) __ 108 6467 Wilson, J. H., Geophysics in the Permian Basin (8) ______111 6736 Wilson, J. T., Surface waves in a heterogeneous medium (3) ____-___ __ 111 6719 138 GEOPHYSICAL ABSTRACTS 108-111, JANUARY-DECEMBER 1942

No. Abst Wilson, R. W., Application of mud-analysis logging in Gulf coast area (7)___- 110 6651 Windes, S. L., Seismic effect on quarry blasting (3) ______109 6523 Wolf, Alexander, A mechanical device for computing seismic paths (3) _ 109 6526 Wolf, Alfred, The limiting sensitivity of seismic detectors (3) ______110 6636 The impedance of a grounded wire (4) _ j Wood, H. O., Earthquake history of the United States, Part 2, Stronger earth­ quakes of California and western Nevada (9)_ _ 108 6459 A chronologic conspectus of seismologic stations (3) 110 6637 Earthquakes and disturbances to leveling in the Imperial Valley, 1930-31 (3)______-______-______111 6720 Wood, J. T., Geology and development of the Paloma field, Kern County, Calif. (8) ______-______111 6737 Woods, J. P., Seismograph-amplitude control, Canadian patent 405,035 (10)_ 110 6695 Multiple-recording galvanometer, U. S. patent 2,269,414 (10) ______111 6748 Woollard, G. P., Geologic correlation of areal gravitational and magnetic studies in New Jersey and vicinity (1, 2)-______108 6380 Worrell, F. T., On the calibration of the Wenner seismograph (3)____ _ 109 6527 Wyckoff, R. D., Seismograph amplifier, U. S. patent 2,276,708 (10)____ 109 6578 Apparatus for and method of seismograph prospecting, U. S. patent 2,276,709 (10) ______109 6579 Z Zinzer/R. H., The use of electrode spacing in well logging (4) 111 6725 Zuschlag, Theodor, Geophysical-exploration apparatus, Canadian patent 402,212 (10) ______1______109 6584 Geophysical-exploration method, Canadian patent 402,526 (10) ______109 6585 Apparatus for geophysical prospecting, U. S. patent 2,278,506 (10) _ 110 6670 Apparatus for geoelectric and seismic investigations, U. S. patent 2,288,310 (10)______110 6691

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