Len Horowitz, of History of Recorded Sound (http://www.hrsrecords.com/ ) contributed this to the site a while back. I'm finally catching up on my scanning, so here it is.
It's 4 pages of conversions and formulas that you might find useful in your travels. Lots of stuff involving diameters and speeds of rotating capstans, wheels and reels. Perhaps someone else can better describe this, so it will "find" easily in the search engine.
- Steve E.
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Calcs and conversions, wheels, reels and capstans
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