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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
> dnw
>