AUDIO Engineering – November; 1953
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it CAN be ATTRACTIVE - see page 30 www.americanradiohistory.com only offers you all this valuable new information e . e and it doesn't cost you a cent! 20 PRIZE -WINNING ARTICLES from Audio's International Sound Recording Contest Here's a wealth of new ideas on how to short time in all of niy years in the busi- use tape and disc recordings to achieve ness." And another judge stated that "the greater economy and efficiency in radio, information and descriptions of recording and Switzerland. The 20 best articles, TV and sound studio operation. operations conducted in small radio sta- which were awarded cash prizes totaling With reference to these articles, one of tions and recording studios throughout 81400, will be published in the pages of the contest judges commented as follows: the country has been quite an education." Audio Record. The information thus made "I have never received so much informa- Contest winners include entries from lI available to the industry will be of real tion which was new and exciting in such a different States, as well as from Canada value to sound recordists everywhere. QUICK FACTS ON MAGNETIC TAPE RECORDERS Each year, Audio Record brings you a published in September, is the most com- complete, up -to -date listing of all makes plete and authoritative compilation of and models of tape recording machines tape recorder information available to the -with conveniently arranged price and industry. Over 75,000 copies of the last performance data. This directory issue, issue were distributed. e e plus many other articles of timely IT'S YOURS FOR THE ASKING interest to the sound recordist Audio Record keeps you well informed on all the latest trends A letter or post card will add your name to the Audio Record and technical developments in all phases of tape and disc mailing list. And if you would like to have others in your recording. It is not an advertising publication and its sole pur- organization read it also, send their names along, too. Just pose is to render a needed and useful service to the industry. write to Audio Devices, Inc., using the Dept. No. listed below. Audio Record, published 8 times a year, is currently dis- All requests addressed to this Dept. will be started t :ith the tributed free of charge to a request mailing list of about July -Aug., 1953 issue, so you will be sure to get all the prize. 35,000 sound recordists in broadcasting stations, recording winning articles, as well as the 1953 Tape Recorder Directory studios, schools and colleges throughout the country. Issue. AUDIO DEVICES, Inc. Dept. AR -I, 444 Madison Ave., New York, N. Y. Export Dept.: 13 East 40th St., New York 16, N. Y., Cables "ARLA6" www.americanradiohistory.com -1 Successor to ;TA.) (i -Established 1917 Engineering INCLUDING WRITERS ENGINEERS, E. E. or PHYSICS for preparation C. G. McProud, Editor and Publisher GRADUATES, Henry A. Schober, Business Manager of technical manuals... Harrie K. Richardson, Associate Editor Edgar M. Villchur, Contrihuting Editor Robin Melton, Production Manager S. L. Cahn, Advertising Director HUGHES RESEARCH AND Edgar E. Newman, Circulation Director H. N. Reizes, Advertising Manager DEVELOPMENT LABORATORIES' expanding program for pro- Representatives duction of radar, electronic H. Thorp Covington, Special Representative digital computers, guided 7530 North Sheridan Road, Chicago 26, III. Sanford R. Cowan, Mid -West Representative missiles and other military 67 W. 44th St.. New York 18, N. Y. advanced electronic systems and devices requires the West Coast following: James C. Galloway J. W. Harbison 816 W. 5th St., Los Angeles 17, Calif. ELECTRICAL ENGINEERING AND PHYSICS GRADUATES to prepare CONTENTS NOVEMBER, 1953 Vol. 37, No. 11 operating, servicing and over- hauling instructions for complex Audio Patents-Richard H. Dorf 2 electronic equipment. Those with previous maintenance Londnn Letter 8 experience on military equip- Audiology-W. R. Ayres 12. ment preferred. Writers will Editor's Report 16 participate in a three -month Make Your Own Woofer -Curtiss R. Schafer 19 program in our technical 20 training school to become Housing and Finishing Equipment -William H. Burke familiar with the latest Hughes The Piano -Part II- Albert Preisman 22 equipment prior to writing Handbook of Spund Reproduction-Chap. 14-Edgar M. Vilkhur 25 assignments. Audio Fair and AES Convention 29 it CAN be ATTRACTIVE 30 gl ENGINEERS EXPERIENCED in the The White Powrtron Amplifier -Stanley White 32 writing and preparation of maintenance manuals for Audio ETC - Edward Tatnall Canby 34 electronic equipment or guided Record Revue-Edward Tahfall Canby 38 missiles. These specialists will New Literature 43 work step -by -step with the Book Review 49 people designing, developing 50 and manufacturing the products New Products involved. Experience in the Technicana 57 writing of engineering reports Radio's Master Reports 70 is of value. Industry Notes and People 71 Advertising Index 72 COVER NOW TO APPLY I L J This montage picturing installations made by Kierulff Sound Corporation, Los Angeles distributor and custom builder, just goes to show how the home Write full details music system -even including television-can be made to fit into the of your qualifications to general decor of the home. Note that there are no unsightly wires. and that each of the systems appears to fit into its sur- roundings. 2E's pages are always open to individ- uals and professionals who have attrac- HUGHES tive and novel installations that might lead newcomers into s_ J the hi -fi fold with- out upsetting Research and Development decoration Laboratories plans. SCIENTIFIC AND ENGINEERING STAFF Culver City, Los Angeles County RADIO MAGAZINES, INC., P. 0. BOX 629, MINEOLA, N. Y. California AUDIO ENGINEERING (title registered U. S. Pat. OR.) Is published monthly at 10 McGovern Avenue. Lancaster, Pa. by Assurance is required that relocation Radio Magazines, Inc.. Henry A. Schober. President; C. G. McProud, Secretary. Executive and Editorial Meer of the applicant will not cause disruption 204 Front SL, Mineola. N. Y. Subscription rates -United States, U. S. Possesaloes and Canada. $3.00 for year, I of an urgent military project. $5.00 for 2 years; elsewhere $4.00 per year. Single copies 35e. Printed In U. S. A. All rights reserved. Entire contents copyright 1953 by Radio Magazines, Inc. Entered as Second Class Matter February 9. 1950, at the Poet Office, Lan- caster, Pa. under the Art of March 3, 1879. J AUDIO ENGINEERING NOVEMBER, 1953 1 www.americanradiohistory.com AT RICHARD H. DORF* S MANY READERS KNOW. the writer has 1933 done considerable research in the field 1,937,021. John Hays Hammond, a pro- of electronic musical instruments. lific inventor, not connected with Ham- One mond Organ. Photoelectric instrument. product of this research has been articles 1,937,389. Nicholas Langer, well known such as the one on the Hammond Chord primary worker with relaxation -oscillator organs. A gas -tube design. Organ which appeared in the September 1,940,093. Bell Labs. Heterodyne instru- issue of 1E. ment with pitch controlled by a "trolley - Another product of the research is a car motorman's" handle. large collection of U. S. Patents covering 1935 electronic music. Such patents, whether or 1,993,890. Langer. Monophonic neon- not they describe circuits and devices which lamp instrument. have reached the commercial market (most 2,014,741. Photoelectric organ, timbres not), generated directly. have serve the researcher -designer 2,017,542. Langer. Synchronizing octave with ideas, schemes, germs of solutions, strings of neon oscillators from a master angles of approach. He may pick the brains oscillator. 1936 of a hundred inventors for the kindling 2,035,238. Langer. Plucked- string effect which his own match may set afire with with neon lamps. a new and brilliant design. Or, if he is not 2,039,651. Langer. Improvement on an original designer by skill and tempera- 1,993,890, allows fine tuning of individual notes. ment, he may use the same hundred in- 2,044,360. Langer. Another method of ventors' ideas to piece together his own syncing neons. musical instrument with individual circuits 2,046,463. Dr. Winston Kock, assigned lifted bodily from to Baldwin, whose organ he mainly de- Transformers for Television the patents. signed. Various neon oscillators including A good deal of mail has indicated the inductors. ... Radar... Aircraft .. interest in electronic music. To serve 1937 readers in that category, this month's patent 2,070,344. Harry F. Waters. Neon in- article gives a selected list of patents on strument with continuous -tuning mounted device Geophysics... Radio the subject. They are arranged in groups, on replica of a violin neck. covering the important aspects of electronic 1938 You will find Thermador ready, willing music. Almost every patent, however, treats of more than the subject 2,128,367. Kock. Thyratron octave and fully qualified to handle your trans- under which it strings. is listed. The patents are listed by year, to 1939 give the reader former requirements. Engineering an idea of their "freshness." 2,148,166. Tones generated In each by cathode - experience and manufacturing know - category there are listed first ray tube. what the writer 2,171,936. More of the considers the most interest- inventor. same by the same how, developed over a period of 35 ing and useful, with a brief descriptive 1940 years, form the hard core that makes comment on each ; following that others, less important 2,185,635. Kock. Improvement on 2,128,- Thermador today's largest West Coast are listed by number only. 367. To conserve space we have not followed 2,221,097. James A. Koehl, v.p. of Cen- manufacturer of electrical appliances and standard bibliographic procedure, tral Commercial Industries, but give Lowrey maker of transformers.