[78-L] November 9, 1921

[Michael Biel]

From:<neechevoneeznayou at gmail.com>

> So how did a radio station broadcast 78s? I mike in front of a horn?
>
> joe salerno


On 8/23/2010 7:51 AM, Milan Milovanovic wrote:
> As early as 1928. in Yugoslavia, in experimental Radio station - Radio
> Belgrade, Slovenian scientist named Mario Osana developed (for broadcast
> purposes) thing that would be later better known as electric (MC) pickup.

By 1928 the manufacture and availability of electrical pick-ups was 
widespread.  Brunswick had been marketing an all electric phonograph 
since 1925 and Victor and other companies had added electrical pickups 
by 1927.  All the radio and gramophone magazines had advertisements for 
electrical pickups you could add to your phonograph to attach to your 
radio, and broadcast studio turntables were in common use by then as 
well here in the U.S.  What Joe had alluded to about putting a 
microphone in front of an acoustical machine was during the earlier 
years such as Frank Conrad's 8XK in 1919 and the early broadcast 
stations in 1920 thru 1925 and I had already posted info about the 
Magnavox Transmitter Tone Arm which was marketed in 1920 with a carbon 
button transmitter built into an acoustical arm.  .

> Described in technical data this cartridge was capable of picking horizontal
> undulations of the groove only, while at the same time canceling the
> vertical component:

Edison records were vertical, of course, and Theodore Edison was working 
on an ultra long playing vertical broadcast transcription system in 1927 
that was called inside the company Rayediphonic.  At the Edison Site 
they have a new exhibit of a lot of machines that have never before been 
on display, and one of them is the Cinemusic machine which was part of 
the Rayediphonic experiments.  To play the vertical records they have an 
arm with a standard lateral horseshoe magnet pickup laid on its side 
with a mechanism that attaches the pickup to a Edison diamond disc 
stylus lever.  In 1928 they did market an electrical phonograph with a 
combination pickup that could be used for vertical and lateral, but the 
transcription system never got beyond the experimental stage.  Western 
Electric and Byers Labs both introduced vertical broadcast 
transcriptions in 1930 and 31, and broadcasters usually had turntables 
with a separate tone arm for each system until the late 30s.

Mike Biel  mbiel at mbiel.com



> "To broadcast music from records we are using a special device, which
> converts records directly from the vibrations into electrical current
> without a microphone. This reproduction is cleaner.
> Between two magnets, which are wounded by isolated wound wire, was placed an
> iron fin, and at the end there is a stylus. Lamella vibrates according to
> the music on records and induces the magnetic induction in coils
> electricity, which are copied exactly impressed vibrations on record.
> However, there isn't any somewhat familiar sound of gramophone reproduction,
> since the needle can vary only in transversal direction - the direction of
> recorded music. In another direction needle can not vibrate and therefore
> does not induce the relevant power in coils"

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