I have read that Danish inventor Vladimir Poulson had an AC generator in
his lab, and that was very early 20th century. Perhaps an electronic
source for a tone was available in Edison's day, altho I would assume
very expensive at the time.
It appears that electro-mechanical oscillators date back to the 1860s:
On 4/15/2013 2:45 PM, Mickey Clark wrote:
> I have a similar record - except the number is 3342-B-4-? a small mark
> obscures the digit after the 4. It could be a way of establishing
> whether the governer in the Edison phonograph produced wow. Maybe a
> pantograph from a mechanical source could have provided the original
> tone e.g. mechanical in origin -not audio-Mickey
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> ----- Original Message ----- From: "Dan Nelson" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, April 14, 2013 10:34 PM
> Subject: Re: [ARSCLIST] Edison "tuning" disc ?
>> What in the world is this Edison "tuning disc" #3342B21 ?
>> It sounds like 800hz tone but they didnt have tone generators back
>> then did they? maybe tuning fork over and over.
>> Many thanks for info on what it was for and how it was made