[78-L] VTMC Strobe Disc

[Royal Pemberton]

Would it work as a jpeg image on Photobucket or such like?

On Fri, Nov 4, 2011 at 11:05 PM, Michael Biel <mbiel at mbiel.com> wrote:

> During the discussions about how 78.26 rpm was chosen, I have debunked
> the unsupportable idea that it was the result of a gear-ratio
> calculation because all turntables at that time had continuously
> variable speed governors.  The answer was, of course, the strobe disc.
> During a discussion I was asked once whether I had PROOF that Victor
> Talking Machine Co. used a strobe disc, and I said that I had once seen
> one and that Dennis Valente's company sold a reproduction of the strobe
> side of the disc.
>
> Well, now through the kind auspices of Tim Fabrizio, I have a Victor
> Talking Machine Co. "60 Cycle Stroboscope Disc for testing speed of
> talking machine turntables".  The speed it mentions in the instructions
> is 78 revolutions, not 78.26, but a 78.00 strobe disc is impossible with
> 60 cycle lighting. 78 was always the simplified speed cited, never
> 78.00.  It is Part 18436, and it would be great if it would be possible
> to place this part number in the chronology of Victor parts manufacture
> to date it.  It is obvious that it is pre-RCA, so it is prior to 1929
> but could be much earlier.
>
> I have scanned both sides of the disc, and if you wish it to print for
> yourself, contact me off-list.  I would also like to post it on a
> graphics site as well.
>
> Mike Biel  mbiel at mbiel.com
>
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