The talking machine world (July-Dec 1925)

August IS, I92S THE TALKING MACHINE WORLD Revolutionary Sound Reproducing Method Announced By Brunswick Co "potsibkTefo.S Runn^'^R Sensatlonl New Means for Electrical Record.nE Which Makes Possible Records Runn.ng Forty Minutes and Reproduced Through Medium of Vacuum Tubes 58c I'. I.. Dr. ick of ( hi, of ^■o^k on Wtclncscliiy. Auyust 12, that liis company, Uic General Electric Co., the Radio Lorporalioii of America and ilic Wcstinyhoiisc lilcctric Co. had joinliy pcrfccttd a new scundrcproducing instrument which represents a radical devclopmenl in sound recording and reproduction. Ihi. lave-., I fihn d nls i\U Ml, The New Process The recording of ihi '^i.timl w;. was said, witii infiriilf dcliciLv Ij' proi-ess used in recording -onnd film, or PaHolropt, invented I. Movie, of the (Icncral l-Jcctrn C o ill ilctail from llu' I'lronoli Forest, After the roconl li;,s Iner ncr it outwardly reseniKlerei-ord. it is played with a i linns are clianyetl into ele then .-itLppcd np by vacnnni the required vohnne, and tli vil.ralini; disk, nislea.l of a ■en named the Toduccs all ocio and talking )in>noL;rapli, is done, it neans of the I (he lalkinCharles A, which dilTcrs ( Dr. I A l)e niaile in this manIhe ordinary disc edie hut the vibrairical current and :elh as in radio lo n reproduced by a ■fli I tlK ord.nary |jlioiiograpli rcccli. ,iiid Ihe 12-nich recortl > livr nnnnles. So mmli hi' vcd in Ihe Pallotrope i Mr, Denlscli, that the I MID to an inch and 12h' lTi niaile to reproduce ■ record hi^lini.' for aliont ord are ctit ,S0 i runs for appm greater deliuai.records, aei ni . grooves li;n !■ I inch disc rccoi' whole -symphoi forty niinules. Record to Play Forty Minutes The forty-iiiinule record is a laboratory arlicli al present and will not, for cinuincrcial reasons, be introduced for some lime lo come, ac hrst records by ri < ktober. 'I'hey on existing ])ho, the first exainn Ihe market in new records are ? minutes, with cording lo Mr, Diniscl Ihe new process will be issued .r are designed to be us-d either no^raphs or on the J'analrope |des 111 which will be placed o Oelobcr. ( )n this .iccount the Jiiade to be nm four or I'lvi (grooves of ihe ordinary widlli. "This instriiineiit is Ihe result of heartiest cooperation between the radio and plionograph interests." said Mr. Deutsch. "It has been .iirgely developed by radio engineers willi the help of radio patent-,. There is entire harmony between the two inlerests. ■'The new instrument is not called a plionograph. It is music reprnduclion by an entirely different process. "While Ihe phonograph is limited lo reproducing sound-waves roughly between 1,000 and 2,000 per second, this iirsirument reproduces sound-waves anywlitre from 100 lo 7,000 or 8,000 a second. ll reproduces with accuracy every pitch to which the ear is sensitive. I he rtsults are perfect with the full orchestra, the human voice, llic piatio and even with inslninn nt.-, like the harpsichord, which have never been -ni fully recorded by the old processes. Public Demonstration in October "There will be a public demonstralion of the new instrument in perfected form at Carnegie Hall in October, when ihe inslrumeni will be ready for ihe market. \iy the use of Vacuum lubes, the volume from the instrument may he varied from that siiilabic to a small room to lliat necessary lo fill an auditorium. "liL spile of ihe vru uiini tube amplification Ci|uipinenl, the c.ihimi Im ihe I'anatrope will be slightly S)iiidki Ih.in llu' ordinary phonograph cabinet, ll can be run either with balIcries or by connection through the electrical sockel. The cost of lunning it is very chea|). considerably less than thai of running a .stnall electric fan. The vacunm lubes will last from lh.ee to five years. The prices of Ihe instruments, which will be placed on the market in October, will run from $200 lo $500, largely dep:.'nding on the style of the cabinet. Available for Present Machines "The disc record will be used at present, because we want lo adapt the product to the use of the millions of phonograph.s now in existence, but the reproduction can be done by films, on which Ihe sound waves an photographed. ISy this nielhod the record can be made lo play for any length of time. "In order to reproduce the film records, the instrument must he equipped with the apparatus for sending a beam of light through ihc fihn lo .1 I'liotographic cell so as lo turn the sound waves iiiio eleclricily, after which ihe electrical waves an amplified by the vacuum tnbe-s. This app.ivaliis, liowcver, is no! cosily or cumbersoini', .uid there is no reason why ihc device usin;; the hliii records may not become an ordinary household musical inslrumeni. In all developments of this kind, however, it is necessary to protect the owners of existing apparatus as fully as possible." The Pallotrope Modified The Patlolrope. which was developed by Ihe General Electric Co. to photograph sound, has been modified considerably for its use in recording sound waves on discs. The sound waves produced by the speaker, singer or musical inslrumeni are made to vibrate a light. The variations of the light are changed by ihe photoelectric cell into variations of electrical current. These are amplified by tubes until they are ])owerfnl enough to operate ihe engraving tool wliicli cuts the sound wave pattern in the grooves cif Ihe phonograph disc. .-\fter the new type of record is made in this way. it may be reproduced either by the needle vibrating a diaphragm, as in the present phonogr.iph, or by the "new sound-reproducing instrument which works as follows: An ordinary phonograph needle is used to take the vibration from Ihe records, but instead of being communiealed lo a diaphragm the vibrations are transferred to an iroti "reed" which is placed in tlie centre of an electrical coil. The vibrations of Ihc iron reed in Ihc electrical field cause infinitely fine variations of current. The faint current which is modulated iu this manner is amplified by the scries of lubes and at the end it vibrates the disc, transforming the electrical current back into sound. First New Records The records made by this process, which will be issued in October, inehule the interme/./o and prelude lo the •■('.iv ,< 11. rin Rn-ti.-ana" by ihc Melropolitan Opera Mun-, iir,h,-lra, eonducled by Papi; Schnberi^ "\\ on the piano, by Godowski; Ir .Serenade by Arensky on the vi a so|)rano solo by Virginia Kca "Hy Ore he lo lb ra; Gei : Sun" by Ihe I Uoll and Uobi harp-i.linrd sni of the new instrument ove Hentseh said that exiieriinenl' In develop a iK rmaiu ni iin d e tise of Ihe tnbts Inr ainidil -rli s;iid Ihal the original vibr ■■. >n i\ nii}jhl he inlinitely faiiil, glitesi possible contact was m 1 Militairc" -anient and by I'iastro; isky-Korsallrunswick n Adair, by ohi by Lewis I 111 ( "ritcrion I" ,.nd "Anvil I h, baud; a Hid .1 number II i\ .IS made ihe performwide musical iwecn the needle and record, thus reducing the wear on the needle and the record to a minimum. 1 he announcement when received by the trade m Ihe I'asl created little short of a furore for 'I was the ^^^l i.ingibk inforn.alion thai ha^ been offer. d regarding those new developnienK in reeordini; and reproduction which have been heralded so [>e^.^is|c■,lll v lor months past |„u regarding which so few facts are avail.ib'le lo Ihe industry. Particular gratification was found in the fnct that although ihe new instrument is deemed lo be little short of sensational, arrangements have been made to protect the public and ihe Irad'.-by making the new recordings, to a substantial exlciit. al least, available for graphs already on the market. It is understood that the trade further details regarding the new product direct from the company i near future. on phono vill receive Brunswick D the very Charges a// I Storage Batteries j The New TWIN BULB Quickly Qmtli/ Safety Ch.iri -h-irgers as well as orhcr radio equipment have been improved. That is why wc have the New Twin Bulb Handy Ch.irgcr. Ic is die l.isc worj m h.utery chargers, Rcf^.^rJIc.s of m.,kc or voliaec It wdl char^ce your "A ■ .,,,,1 -R ^^^ragc Batteries at a fast rare and wichouc the slightest no'se. The Twin Bulb Charger cannot discharge or overcharsc your batccT)', therefore it is p.irricularly adaptable to overnight chiirging. The "push-pull" method of charging is employed by this new Twin Bulb HANDY, using both halv.-s of the AC wave, ThiiaJiMnced principle accounts forthefnscr.itcofth.irge Charges "A" Batteries 4-5 Amperes to 6 volt batteries. Charges *'B" Batteries up 10 no ''-•^ your nc.ircst radio