DECEMBER 8, 1883. THE ENGINEERING AND JOURNAL. 351 ERIN hitherto experienced with Bessemer metal for structural and machinery Tax ENGINE G URNA], purposes. THE Second Geological Survey of Pennsylvania, of which Mr. CHARLES A. ASHBURNER is geologist in charge, is about to issue four additional Entered at the Post-Office of New York, N. Y., as Second-Class Matter. sheets of the survey of the anthracite coal-fields. Three of these sheets are a reproduction, with certain additions, of the topographical map con- VoL. XXXVI. WITH SUPPLEMENT. No. 28. structed for the Lehigh Valley Coal Company, by STEPHEN and JOSEPH S. Harris and A. J. WoMELSDORF, from 1868 to 1875, and supplemented RICHARD P. ROTHWELL, 0.E., M.E., ‘ by maps of special areas constructed by LEwis A. and 8, RiLEy, and the ROSSITER W. RAYMOND, Ph.D., Editors, Second Geological Survey. This map gives the topography in 10-foot con- CHARLES KIROHHOFF, Jr., M.E., tour lines of that portion of the Western Middle coal-field between Quakake Nore.—Communications relative to the editorial management should be addressed to Junction and Mount Carmel. To the original map have been added north Eprror, P.O. Box 1833, New York. Communications for Mr. RayMonp should be addressed to Rossirer W. RaymMonpD P.O. and south and east and west lines, 2000 feet apart, referred to the true Box 1465, New York. Articles written by Mr. RayMonp will be signed thus * ; and only meridian, and the approximate outcrop of the lowest, the Lykens Vailey for articles so signed is he responsible, SvuBsorIpTIon Price, including postage. for the United States and Canada, $4 per coal-bed, and a number of other features. The fourth sheet gives the annum ; $2.25 for six months; all other countries, including postage, $5.50 = 22s. = details of the Mount Carmel, Centralia Coal Ridge or Montana, German- 28 francs = 22 marks. All payments must be made in advance. town, and Mahonoy basins, on the general plan repeatedly referred to in | FILE Covers will be sent by mail for $1.25 or delivered at office for $1 each. Advertising Rates.—See page vii. our columns. Mr, C. A. Green is our accredited representative for New York. Here, we may call attention to the fact that the Survey has recently Mr. A. R. Brown, Jr., is our accredited representative for Boston and the Eastern made a modification in its plan of selling these maps which will commend States. Office, Room 1, Simmons Building, 40 Water street, Boston. itself very favorably to intending purchasers. Hitherto, the Survey Mr. J. Viennot, 150 South Fourth street, Philadelphia, is our accredited representative has not offered them for sale before an entire atlas was completed. Now for Philadelphia. two hundred copies of each sheet, of an unfinished atlas, will be sold Mr. A. H. Taylor is our accredited representative for Chi sago and the Northwest. singly, as soon as printed, and those who have immediate use for them Mr. O. D. Cotton, Columbus, O., is our accredited representative for Ohio, Ken- tucky, and Indiana. can therefore procure them by addressing Mr. WILLIAM A. INGHAM Mr. O. J. Frost, care Boston & Colorado Company, Argo, Colo., is our Secretary, 907 Walnut street, Philadelphia. The topographical sheets accredited representative for Denver and vicinity. referred to above will, we understand, be sold ata price of eleven cents REMITTANCES should always be made by Post-Office Orders or Bank Drafts on New York, made payable to THE ScienTIFIC PUBLISHING COMPANY. each.

THE SCIENTIFIC PUBLISHING CO., Publishers, THE following figures, from the report of the Bureau of Statistics for R. P. ROTHWELL, Pres. HENRY M. GEER, Sec. and General Manager, the year ended June 30th, 1883, show who during that time had been P.O. Box 1833. 27 Park Place, New York, our principal customers for copper, in the form of pig and , the former, we presume, including matte, while the latter embraced probably black CONTENTS. copper as well as the refined metal : ———-Ore.———. —Pig, Bar, and Sheet.— EDITORIALS : ° Pace. | Notes: PaGEe . Cwts. Value. Pounds. Value. NN isc i. cptgeet he 10,080 $3,550 5 ee oe The Clausthal School of Mines...... 351| Delaware & Hudson Canal...... 352 Central American States ..... 0 ...... seeees 6,656 $1,128 A New Process for Producing Steel The Cable Grip Patent Infringed..... 352 aaa! nacdcve suites iasesne