DOCSLIB.ORG

RADIOECTRONICS in ALL ITS PHASES for Better Curves

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
RADIOECTRONICS in ALL ITS PHASES for Better Curves 1 "FLYING SPOT" TELEVISION TUBE SFi- TfIfVISInN SlrtlON RADIOECTRONICS IN ALL ITS PHASES For Better Curves Where They Count Most! Accurate taper curves prove correct resistance ments - and adds manufacturing skill and values. When you install a Mallory carbon repeated quality checks that assure you com- control, you know that your customer will get plete customer satisfaction when Mallory the fine, smooth tone gradations that result products are used. from tapers that are mathematically accurate. Mallory offers the most complete line of Mallory uses an exclusive method of applying volume controls- standardized to make them the talcum -fine carbon so that the fields of easy to stock. resistance are perfectly feathered for core rect attenuation. Mallory makes the three replacement parts that The Mallory 1485 Control Deal This attractive metal cabinet contains the are used on the majority 15 Controls and 9 Switches that will take of your jobs: volume care of 90% of your service calls. Its arrange- ment makes inventory control almost auto- controls, capacitors and matic-saves you frequent trips to the distrib- utor's e ter. It contains a rack for your vibrators. Into them, Radio Service Ency- Mallory builds design clopedia. You pay only for the Volume Con- experience that has been trols and Switches; the cabinet is included in acquired by constantly the deal at no extra keeping a step ahead cost to you. Check your Mallory distributor on Mallory controls are carefully tested J taper The esrlutire method of applying of commercial radio - this special offer. carbon Aires a Inure gradual taper curve than is produced by n elertronir develop. P R. MALLORY 8 CO..Inc. CAPACITORS ... CONTROLS ... VIBRATORS .. SWITCHES ... RESISTORS ... RECTIFIERS .. MALLORY VIBRAPACK* POWER SUPPLIES . FILTERS Reg. U. S. Pot. off. APPROVED PRECISI! 1ICTS, 1 /Ivìs SFiva You 9OTH / 64 PAGE BOOR See bow I give you practical ex- while still learning. Read letters perience building Radio circuits from men I trained, telling what at home with BIG KITS OF they are doing, earning. See the PARTS I SEND. Illustrated kind of fascinating jobs Radio. books shows how you make extra Television, Electronics offer. money fixing Radios in apare time FREE with coupon below! Same coupon entitles you to FREE "superhet" circuits work, three rea lesson, "Getting Acquainted With sons why tubes fail, locating defects. Receiver Servicing." Discloses short- repairing loudspeaker. Over 80 pic- cuts Radio Repairmen use. Tells bow ture., diagrams. FREE! Send coupon 1 See for yourself how / train you at home to BE A RADIO TECHNICIAN Do you want a good -pay job in the fast- growing RADIO and Television-Electronics Industries? Or do you want You Build This MODERN RADIO with Parts I Send to be boss of your own money- making Radio shop ? Here Complete. powerful Radio receiver brings in is your chance! local and distant stations, N. R. I. gives I've trained hundreds of men to be Radio Tech- you ALL the Radio parta . speaker. tubes. nicians . men with no previous experience. I chassis, tram can do the same for you! My unique train -at -home method makes learning easy. I send you BIG former, sockets. KITS of Radio parts. All equipment yours to loop antenna. ate. keep. You get practical Radio experience building, testing and experimenting with Radio circuits. Mike EXTRA Wars I. sere Tim The day you enroll, I start sending you EXTRA MONEY booklets. You LEARN Radio and Television principles from my easy - to-grasp, step -by -step illustrated lessons. You PRACTICE with parts I send. You USE your know -how to make extra money fixing neighbors' Radios in spare time. From here, it's a short step to your own shop or a good pay Radio job. N.R.I. -Traéd Me. Feet Brigid Future Think of the money -making opportuni- ties in Police, Aviation, Marine Radio, Broadcasting. Radio Manufacturing. Radio Repairs, Public Address work, etc. And think of even greater opportunities as Tele- vision, FM and Electronic devices become more and more available. see what N.R.I. Cs. D. For Ye. Act now! Send for my IX/UBLE FREE OFFER. Coupon entitles you to actual lesson. GETTING VETERANS AC1¡UAINTFID WITH RECEIVER SERVICING," 1 al's lutely free. Discloses short -cuts of Radio repair Also men. Over 80 pictures and diafiramal Also get my GET THIS 6t -page took 'HOW TO BE A SUCCESS IN RAD10 TELEVISION - ELECTRONICS." Tells more about YOUR opportunities details of my Send You Many TRAINING Course. Read letters from men I trained, telling what they are doing and earning . see how quickly, easily you can get started. Send coupon in UNDER envelope or paste on penny postal. J, E. SMITH. Other RADIO KITS Pros.. Dept- NIX . National Radio Institute, G. I. BILL Pioneer Horns Study Radio School. Washington 9, D. C. I TRAINED THESE MEN MR. J. E. SMITH, President, Dept. MX I National Radio Institute, Washington 9, D. C. "Now have two Radio and 64 -page book about how to win I for Mail me FREE Sample Lesson shops, servicing about time cash to pay my success in Radio and Television -Electronics. (No salesman will call. I 200 seta a month. High- Course by time I gradu- I Please write plainly.) ly successful our first ated. N. R. I. training I 110 full year. " -A RLEY is tops!" - ALEXAN- Age STI'DYVIN, Desoto, Missouri. DER KISH, Carteret, New Jersey. I Name I I Address I My Course Includes Training in 1 City ... Zone State TELEVISION Check If Veteran I APPROVED FOR TRAINING UNDER G. I. BILL ELECTRONICS - FM ......... ea ..... am a..a August, 1948, Volume XIX No. 11. Published monthly by Itadcraft Publications, Inc.. 29 Worthington Street, RADIO- CRAFT, Maee.. of 3, 1879. Springfield 3, Men. Entered es second class matter at Post Office. Springfield. under the Act March Ca itol Radio En, ineerin Institute- Pioneer in Radio Engineerin Instruction Since 1927 How Much Competition Have You ... For Your Present Job -For a Better Job? Enjoy Security and Good Pay! Step Ahead of Competition into We invite you to see, without obligation, just what CREI home a BETTER RADIO JOB with CREI Technical Home Study Training. study training can do for you. Beginning right now CREI can Protect your future today -keep ahead of the man who is provide on- the -job- training that is practical and thorough. You waiting for your job -plan for the better job that can be yours. will find it helpful in your daily work right from the very first lesson. You can "go all the way with CREI" from introductory Once again, employers can afford to be "selective ", particularly basic principles (for the man with limited experience) to advanced hen so many ambitious, young men have entered the radio training and specialized subjects (for the man with greater industry since the war. This means you must improve your experience). No matter what your experience, CREI has a technical ability not only to meet the industry's new developments, course for you. but to meet the job competition you are now facing. The facts about CREI and what we can do for you are You may have "gotten by" up to this point. But, if you are described interestingly in our 24-page booklet. It is well worth like many other radiomen, many of the recent technical advances reading. Send for it today. have passed you by. Radio -electronics developments of the past few years call for an entirely new understanding and knowledge VETERANS! CREI TRAINING AVAILABLE UNDER G. I. BILI of technical radio practice. If you have had professional or amateur radio experience MAIL COUPON FOR FREE BOOKLET and want to make more money, let us prove to you we have the training you need to qualify for a better radio job. To help us answer intelligently your inquiry-please CAPITOL RADIO ENGINEERING INSTITUTE state briefly your background of experience. education 16th and Park Road, N. W., Dept. RC -8. W shin`ton 10, D. C. and present position. Gentlemen: Please send your free booklet, "CREI training for your better job in Radio -Electronics," together with full details of your home -study training. I am attaching a brief resume of my experience, education and present position. Capitol Radio Cheek field of greatest interest: PRACTICAL RADIO -ELECTRONICS PRACTICAL TELEVISION BROADCASTING AERONAUTICAL RADIO ENGINEERING Engineering Institute RECEIVER SERVICING D INDUSTRIAL ELECTRONICS NAME An Accredited Technical Institute STREET Dept. RC -8, 16th and Park Road, N. W., Washington 10, D. C. CITY ZONE STATE _.... I AR ENTITLED TO TRAINING UNDER G. I. BILL. Branch Offices. New York (7) 170 Broadway San Francisco (2) 760 Market St. Lear THEY, ' 6- ELECTRONICS 4 SHOP METHOD HOME TRAINING Let NATIONAL SCHOOLS, of Los Angeles, a practical Technical Resident Trade School for almost 50 years, train you for today's unlimited opportunities in Radio Bris end allarr.iard sgetvEneal .e.r praparty, tell you kW" Good Jobs Await the Trained Radio Technician Lessons and You are needed in the great, modern Radio, Television and Elec- tronics industry! Trained Radio technicians are in constant and Instruction growing demand at excellent pay -in Broadcasting, Communica- Material Are Up -to -date, Practical, Interesting. tions, Television, Radar, Research Laboratories, Home Radio Service, etc. National Schools Master Shop Method Home Study course, with newly added lessons and equipment, can train you National Schools Master Shop Method Home Training gives you in your spare time, right in your own home, for these exciting basic and advanced instruction in all phases of Radio, Television opportunities. Our method has been proved by the remarkable and Electronics. Each lesson is made easy to understand by nu- success of National Schools- trained men all over the world.
Load more

Recommended publications
  • Atmospheric Anisotrophy and Its Effect on the Delay Power Spectra of Tropospheric Scatter Radio Signals Hosny Mohammed Ibrahim Iowa State University
    Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1982 Atmospheric anisotrophy and its effect on the delay power spectra of tropospheric scatter radio signals Hosny Mohammed Ibrahim Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Electrical and Electronics Commons Recommended Citation Ibrahim, Hosny Mohammed, "Atmospheric anisotrophy and its effect on the delay power spectra of tropospheric scatter radio signals " (1982). Retrospective Theses and Dissertations. 7507. https://lib.dr.iastate.edu/rtd/7507 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity.
    [Show full text]
  • Recommendation ITU-R V.573-4
    Rec. ITU-R V.573-5 1 RECOMMENDATION ITU-R V.573-5* Radiocommunication vocabulary (1978-1982-1986-1990-2000-2007) Scope This Recommendation provides the main vocabulary reference, giving synonymous terms in three languages and the associated definitions. It includes terms given in Article 1 of the Radio Regulations (RR) and extends the list to technical terms defined in texts of the ITU-R. The ITU Radiocommunication Assembly, considering a) that Article 1 of the Radio Regulations (RR) contains the definitions of terms for regulatory purposes; b) that the Radiocommunication Study Groups have a need to establish new and amended definitions for technical terms that do not appear in RR Article 1 or that are so defined as to be unsuitable for Radiocommunication Study Group purposes; c) that it would be desirable for some of these terms and definitions established by the Radiocommunication Study Groups to be more widely used within the ITU-R, recommends that the terms listed in RR Article 1 and in Annex 1 below should be used as far as possible with the meaning ascribed to them in the corresponding definition. NOTE 1 – Study Groups are invited, where there is a difficulty in using any of the terms with the meaning given in the corresponding definition, to forward to the Coordination Committee for Vocabulary (CCV) a proposal for revision or alternative application, accompanied by substantiating argument. NOTE 2 – A number of terms in this Recommendation appear also in RR Article 1 with a different definition. These terms are identified by (RR . ., MOD) or (RR . .(MOD)) if the modifications consist only of editorial changes.
    [Show full text]
  • Radio Astronomy
    Edition of 2013 HANDBOOK ON RADIO ASTRONOMY International Telecommunication Union Sales and Marketing Division Place des Nations *38650* CH-1211 Geneva 20 Switzerland Fax: +41 22 730 5194 Printed in Switzerland Tel.: +41 22 730 6141 Geneva, 2013 E-mail: [email protected] ISBN: 978-92-61-14481-4 Edition of 2013 Web: www.itu.int/publications Photo credit: ATCA David Smyth HANDBOOK ON RADIO ASTRONOMY Radiocommunication Bureau Handbook on Radio Astronomy Third Edition EDITION OF 2013 RADIOCOMMUNICATION BUREAU Cover photo: Six identical 22-m antennas make up CSIRO's Australia Telescope Compact Array, an earth-rotation synthesis telescope located at the Paul Wild Observatory. Credit: David Smyth. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. - iii - Introduction to the third edition by the Chairman of ITU-R Working Party 7D (Radio Astronomy) It is an honour and privilege to present the third edition of the Handbook – Radio Astronomy, and I do so with great pleasure. The Handbook is not intended as a source book on radio astronomy, but is concerned principally with those aspects of radio astronomy that are relevant to frequency coordination, that is, the management of radio spectrum usage in order to minimize interference between radiocommunication services. Radio astronomy does not involve the transmission of radiowaves in the frequency bands allocated for its operation, and cannot cause harmful interference to other services. On the other hand, the received cosmic signals are usually extremely weak, and transmissions of other services can interfere with such signals.
    [Show full text]
  • 'I'm 1 Continuing Education Company
    March/April 1972 CAJ I: McGrauwHlll 'I'm 1 Continuing Education Company National Capitol Radio Radio Institute Engineering Institute CI Students and Graduates of NRI Important News for You Introducing the CONAR Model 214 Further Adventures of a Part -Time Serviceman Here'sa"Reel" Deal-and a "Hot" Deal (a $37.95 Value)Only $15.40 each(a $39.70 Value) (POSTAGE PAID ) Here's what the "hot" deal includes: 20 Transiolytic electrolytic capacitors Utilize a special low -leakage current con- struction and meet the very special needs of transistorized circuits.Excellent resist- ance to high humidity because of plastic case with thermo-setting resin end -seals. Each unit stamped with rating and polarity. 25 Pacer Film Capacitors Feature metal end caps over extended foil THE REEL DEAL #21AC sections. Assures best possible non -induc- tivecapacitors.End caps alsoeffective Here's what the "reel" moisture barriers. Protected by epoxy coat- deal includes: ing-rugged and durable. 65 Orange Drop Capacitors 90 Kwickette Soldering Best of the dipped tubulars An answer to a serviceman's and a must for applications prayer. These are the solder. an exact replace- YOUR ing aids that are saving tech- ment will fit. "Orange Drops" CHOICE nicianshours and hoursof are the perfect replacements work. Forquickpartsre- for dipped capacitors now used ONLY placement. Practically lets you by makers of the leading tele- do "in - circuit"component vision receivers. $15.40 testing. 130 Kwickette Soldering Aids Kidde Pocket Butane Torch Kit Answer to a serviceman's prayers.Saves Great for all kinds of soft soldering and you hours and hours of work.
    [Show full text]
  • Modem Equipment for the New Generation Compact Troposcatter Stations
    5 UDC 621.396 MODEM EQUIPMENT FOR THE NEW GENERATION COMPACT TROPOSCATTER STATIONS Serhii O. Kravchuk, Mikolay M. Kaydenko National Technical University of Ukraine “KPI”, Kyiv, Ukraine Background. Modem equipment of tropospheric communication lines is an important component of modern means of telecommunication. The theoretical and practical aspects of choosing a preferred embodiment of modem equipment, taking into account the aggregate indicators of quality. Objective. Presentation features the construction of modem equipment of the tropospheric stations of new generation that can provide high data transfer rates with guaranteed quality of service in complex stationary and non-stationary noise inherent in tropospheric channels. Methods. This goal is achieved by using new technical and architectural solutions to build a modem equipment, spectrally efficient modulation types and coding algorithms of effective adaptation to changing operating conditions. Feasibility of the proposed approaches to the construction of the modem hardware is fulfilled on a prototype of the equipment based on the HSMC ARRadio Daughter Card debugging modules. Results. The features of constructing of modem equipment of troposcatter stations with high data transfer rate are provided. To reach the limiting parameters of such stations proposed in the application of modem equipment of new technical and architectural solutions, spectrally efficient modulation types (OFDM plus linear modulation) and error-correcting coding, efficient algorithms of adaptation to changing conditions of work, the SDR technology, frame structures of physical layer. The variants of the configuration of modem equipment in relation to the modes of operation of compact troposcatter station. Conclusions. Ways of improving modem performance to improve the efficiency of modern compact troposcatter radiorelay stations.
    [Show full text]
  • Latest in Television Servicing Audio
    JULY 1951 tAl)I K - ea CS LATEST IN TELEVISION SERVICING AUDIO TELECAR SPEEDS TELEGRAMS 30 7J_E FIROAr-sCV,TINCJ AND COMml.micik flON. U.S. and CANADA In this issue: TV Tube Substitutions Field Strength Meter Pocket Superhet www.americanradiohistory.com tt,cea,flUMDNT A UTOMA TI-FOCU S Completely Provides- Eliminates- AUTOMATIC FOCUSING AT ALL TIMES FOCUSING COIL FINE OVERALL FOCUS FOCUSING CONTROLS REPLACES ALL 17" GLASS MECHANICAL FOCUSING RECTANGULARS WHETHER DEVICES ELECTROSTATIC OR ELECTROMAGNETIC 17" NtAvailable soon in other sizes nUM FOR COMPLETE TECHNICAL INFORMATION - WRITE: TUBE DIVISION - ALLEN B. DU MONT LABORATORIES, INC., CLIFTON, N.J. www.americanradiohistory.com RADI:': -TEL E. SMITH. Prea. aanonal gadia Inslilel. 8000 TECHNICIA FREE y N0 SN upoN A1. Americas Fast Growing Industry Offers You M 1. EXTRA MONEY Available to Imo' IN SPARE TIME Many students In 14 t 5, :r,IU a week extra fixing neighbors' Radios VETERANS in spare time while learning. The day you enroll I start sending you SPECIAL BOOKLETS to show you how to do this. Tester Bill you build with parts I send helps you service sets. All equipment under G.I. is yours to keep. 2. GOOD PAY JOB I TRAINED THESE MEN Your next step is a good job installing and servicing Radio- Televi- Mid Wow, Pam bila Wry IMdakes is TMMUM, Soon after finishingg Have am on shop sion sets or beccming boss of your own Radio -Television sales N. R. I course, An auw¡sedtl - h' ked for servicing a 5 large and service shop or getting a good job in a Broadcasting Station.
    [Show full text]
  • Tropospheric Refraction Modeling Using Ray-Tracing and Parabolic Equation
    98 P. VALTR, P. PECHAČ, TROPOSPHERIC REFRACTION MODELING USING RAY-TRACING AND PARABOLIC EQUATION Tropospheric Refraction Modeling Using Ray-Tracing and Parabolic Equation Pavel VALTR, Pavel PECHAČ Dept. of Electromagnetic Field, Czech Technical University in Prague, Technická 2, 166 27 Praha 6, Czech Republic [email protected], [email protected] Abstract. Refraction phenomena that occur in the lower proper method and its implementation for a specific appli- atmosphere significantly influence the performance of cation. At the end a method for angle-of-arrival spectra wireless communication systems. This paper provides an calculation is presented for precise multipath propagation overview of corresponding computational methods. Basic simulations. properties of the lower atmosphere are mentioned. Practi- cal guidelines for radiowave propagation modeling in the lower atmosphere using ray-tracing and parabolic equa- 2. Radio Refractive Index tion methods are given. In addition, a calculation of angle- of-arrival spectra is introduced for multipath propagation The troposphere forms the lowest part of the atmo- simulations. sphere from the surface of the earth up to several km. From the propagation point of view, the troposphere is charac- terized by a refractive index, whereas the rate of the change of the refractive index with height is of crucial importance. Keywords The refractive index itself depends on absolute tempera- ture, atmospheric pressure and partial pressure due to water Radiowave propagation, Tropospheric refraction, vapor [1]. The predominant dependence of these quantities Ray-tracing, Parabolic equation. on elevation makes the troposphere a mostly horizontally stratified media. The refractive properties of air can be expressed in terms of the refractive index n or refractivity 1.
    [Show full text]
  • Spectrophotometric and Colorimetric Study of Diseased and Rust
    NATIONAL BUREAU OF STANDARDS REPORT U5sa SPECIROPHOTOMETRIC AND CWLCEXMEIRIC STUD! OF DISEASED AND RUST RESISTING CEREAL CROPS By Harry J« Keegan John C* Schleter Wiley A. Hall, Jr., and QLadys M* Haas To U* S. Department of die Air Force Aerial Recocmaissance laboratory Wright Air De'velopment Center Wright-Patterscn Air Force Base, Ohio U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS . V. S. DEPARTMENT OF COMMERCE Sinclair Weeks, Secretary NATIONAL HLREAU OF STANDARDS A. V. Aslin, Director THE NATIONAL BUREAU OF STANDARDS The scope of activities of the National Bureau of Standards at its headquarters in Washington, D. C., and its major field laboratories in Boulder, Colorado, is suggested in the following listing of the di\ isions and sections engaged in technical work. In general, each section carries out specialized research, development, and engineering in the field indicated by its title. A brief description of the activities, and of the resultant reports and publications, appears on the inside back cover of this re[)ort. WASHINGTON, D. C. Electricity and Electronics. Resistance and Reactance. Electron Tubes. Electrical Instru- ments. Magnetic Measurements. Process Technology. Engineering Electronics. Electronic Instrumentation. Elect roeheniis try. Optics and Metrology. Photometry and Colorimetry. Optical Instruments. Photographic Teehnolog\. Length. Engineering Metrology. H eat and Power. Temp<‘ratur<‘ Measurements. ThermodMiamies. Cryogenic Phvsies. Engines and Lubrication. Engine Fuels. Atomic and Radiation Physics. Speetroseop\ . Kadiometrv . Mass Spectrometry. Solid State Phvsies. Eh^etron Ph\si(‘s. Atomic Phvsies. Nuclear Phvsies. Radioaetivitv. X-rays. B(*tatron. Nuch'onic Instruimmlation. Radiological f.quipment. AEC Radiation Instruments. (dicniistrv. Organic (boatings. Surface ClKunistrv . Organic Clnmiistrv .
    [Show full text]
  • Radio-Electronics in All Its Phases Canada 30, Sil Vanl4 Xews Radio Service Edition
    HUGO GERNSBACK, Editor g. o JUN 1 9 4 7 RADIO-ELECTRONICS IN ALL ITS PHASES CANADA 30, SIL VANL4 XEWS RADIO SERVICE EDITION JUNE Prepared by SYLVANIA ELECTRIC PRODUCTS INC., Emporium, Pa. 1947 RADIO SERVICEMEN! SYLVANIA'S COLORFUL NEW CLOCK BIG AID IN SERVICE SALES Specially Designed Famous -Make Clock Identifies Quality Stores Stocking Sylvania Tubes Bright white face ... Fifteen -inch diameterI black numerals! Radio tube in silver e Minute and hour and black...design hands in black ... of carton in famil- unique second iar green and hand in attractive black! red! Telechron move- ment sealed in The words ir "RADIO oil; case in brown SERVICE" in green crinkle finish with and black. The word silver -colored rim "SYLVANIA" in iden- around face! Nominal- tifying green! ly priced at only $7.501 Once you place this big, colorful Telechron elec- your customers are being advised of the advan- tric clock -with its "Radio Service" face -in your tages of placing Sylvania "quality- controlled" window, you'll have an attractive sales aid that radio tubes in their equipment. By displaying identifies your business ... every second of the this on- the -spot sales help you're telling them you day ... as carrying the finest line of tubes made. sell these highest quality tubes. Get this wonder- Through far -reaching advertising campaigns, ful sales aid now ! ORDER FROM YOUR SYLVANIA DISTRIBUTOR or write SYLVANIA ELECTRIC PRODUCTS INC., Emporium, Pu. SYLVANIAELECTRIC MAKERS OF RA010 TUBES: CATHODE RAY TUBES; ELECTRONIC DEVICES; FLUORESCENT LAMPS. FIXTURES. WIRING DEVICES; ELECTRIC LIGHT BULBS A FREE iEssoN alLL. YOU'RE ALWAYS ` ' I'LL TRY, MARY, I'LL) II WITH RADIO--OUR SEWON T SEE WHAT I CAN OD SNOWED DILL HOW NE CO1111 WORK--WILL VOL) FIX IT? WITH IT TONIGHT MAKE GOOD PAY IN RADIO: iVE BEEN STUDYING' Al HOME WITH THE SAY, I'VE SEEN THEIR HELLO, BILL--GOT YES.
    [Show full text]
  • Bibliography on Tropospheric Propagation of Radio Waves
    National Bureau of Standards Library, M.W. Bldg APR 8 1965 ^ecknical ^iote 304 BIBLIOGRAPHY ON TROPOSPHERIC PROPAGATION OF RADIO WAVES WILHELM NUPEN mm U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS THE NATIONAL BUREAU OF STANDARDS The National Bureau of Standards is a principal focal point in the Federal Government for assuring maximum application of the physical and engineering sciences to the advancement of technology in industry and commerce. Its responsibilities include development and maintenance of the national stand- ards of measurement, and the provisions of means for making measurements consistent with those standards; determination of physical constants and properties of materials; development of methods for testing materials, mechanisms, and structures, and making such tests as may be necessary, particu- larly for government agencies; cooperation in the establishment of standard practices for incorpora- tion in codes and specifications; advisory service to government agencies on scientific and technical problems; invention and development of devices to serve special needs of the Government; assistance to industry, business, and consumers in the development and acceptance of commercial standards and simplified trade practice recommendations; administration of programs in cooperation with United States business groups and standards organizations for the development of international standards of practice; and maintenance of a clearinghouse for the collection and dissemination of scientific, tech- nical, and engineering information. The scope of the Bureau's activities is suggested in the following listing of its four Institutes and their organizational units. Institute for Basic Standards. Electricity. Metrology. Heat. Radiation Physics. Mechanics. Ap- plied Mathematics. Atomic Physics. Physical Chemistry. Laboratory Astrophysics.* Radio Stand- ards Laboratory: Radio Standards Physics; Radio Standards Engineering.** Office of Standard Ref- erence Data.
    [Show full text]
  • Alan Milstein's History of Computers
    Alan Milstein's History of Computers CYBERCHRONOLOGY INTRODUCTION This chronology reflects the vision that the history of computers is the history of humankind. Computing is not just calculating; it is thinking, learning, and communicating. This Cyberchronolgy is a history of two competing paths, the outcome of which may ultimately determine our fate. Computers either are simply machines to be controlled by the powerful, by governments and industrial giants, and by the Masters of War, or they are the tools that will allow every human being to achieve his or her potential and to unite for a common purpose. Day One Earliest humans use pebbles to calculate, a word derived from the Latin for “pebble” 17th century B.C. Wolf’s jawbone carved with 55 notches in groups of five, first evidence of tally system 8500 B.C. Bone carved with notches in groups of prime numbers 5th century B.C. Abacus invented, a digital computing device 415 B.C. Theaetetus creates solid geometry 293 B.C. Euclid writes the “Elements” 725 A Chinese engineer and Buddhist monk build first mechanical clock 1617 John Napier invents Napier’s Bones, multiplication tables on strips of wood or bones 1621 William Oughtred invents slide rule, an analog computing device 1623 Wilhelm Schickard of Germany invents calculating clock, a 6 digit machine, can add and subtract 1645 Blaise Pascal invents Pascaline, a 5 digit adding machine 1668 Samuel Morland of England invents nondecimal adding machine 1694 Gottfried Leibniz, who discovered both calculus and the binary system, develops the Leibniz Computer, a nonprogrammable multiplying machine 1714 Henry Mill patents the typewriter in England 1786 Mueller conceives Difference Engine, special purpose calculator for tabulating values of polynomial 1821 Michael Faraday, the Father of Electricity, builds first two electric motors 1832 Charles Babbage designs first Difference Engine 1835 Joseph Henry invents electrical relay 5/24/1844 Samuel B.
    [Show full text]
  • Characteristics of Point-To-Point Tropospheric Propagation and Siting Considerations
    PB161596 NBS ecknic&l tiote 92c. 95 ^Boulder laboratories CHARACTERISTICS OF POINT-TO-POINT TROPOSPHERIC PROPAGATION AND SITING CONSIDERATIONS BY R. S. KIRBY, P. L. RICE, AND L. J. MALONEY U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS THE NATIONAL BUREAU OF STANDARDS Functions and Activities The functions of the National Bureau of Standards are set forth in the Act of Congress, March 3, 1901, as amended by Congress in Public Law 619, 1950. These include the development and maintenance of the na- tional standards of measurement and the provision of means and methods for making measurements consistent with these standards; the determination of physical constants and properties of materials; the development of methods and instruments for testing materials, devices, and structures; advisory services to government agen- cies on scientific and technical problems; invention and development of devices to serve special needs of the Government; and the development of standard practices, codes, and specifications. The work includes basic and applied research, development, engineering, instrumentation, testing, evaluation, calibration services, and various consultation and information services. Research projects are also performed for other government agencies when the work relates to and supplements the basic program of the Bureau or when the Bureau's unique competence is required. The scope of activities is suggested by the listing of divisions and sections on the inside of the back cover. Publications The results of the Bureau's research
    [Show full text]