[78-L] 78-L Digest, Vol 22, Issue 30/tpi

[AllenAmet at aol.com]

In a message dated 7/19/2010 3:00:47 P.M. Eastern Daylight Time,  
78-l-request at klickitat.78online.com writes:

The  dictating machines use, I believe 150 and 160, but 
I don't remember which  is which. 


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The Edisons were 150 tpi and the Dictaphones were 160 tpi.
 
allen