Re: [ARSCLIST] 78 rpm fragments in archaeological contexts

[George Brock-Nannestad <pattac@xxxxxxxx>]

From: Patent Tactics, George Brock-Nannestad

Stephen Barr wrote in response to
Oliver Mueller-Heubach:

......................................

> Keep in mind that, on the outermost grooves of a 10" 78, a length of .52333
> inches of groove
> will provide a second of sonic content. 

----- I can't make these ends meet in my mind. A 78 rpm record makes more 
than one revolution per second, i.e. more than one whole circumference. 
Certainly that must be more than .52333 inches at the outer periphery. 

----- a slide rule was a dangerous tool, because unless you did some mental 
calculation you might be orders of magnitude out. The reason engineers were 
able to use them, is that they were guided by common sense.

Kind regards,


George