[78-L] Record playing speed

[Michael Biel]

> David Lennick wrote:   
>   
>> Yup..24 RPM. I have several discs at this speed. 
>> dl
>>     
Which reminds me of ANOTHER standard!  Theodore Edison was developing an 
extra long playing disc in 1927-29 for broadcasting use that ran at 30 
RPM.   Each rotation was exactly 2 seconds. It was threaded at 300 per 
inch.  Each minute  was 1/10 - inch.  Ten minutes per geooving inch.  
The arms would have a micrometer dial to allow cueing by time.  He also 
experimented with slower speeds of 16 and 12 RPM.  I think the August 
12, 1927 phonograph anniversary broadcast was recorded at that speed. 

Mike Biel  mbiel at mbiel.com