It would indeed, Glenn! Rich's last comment helped me understand this -- one of the original questions was regarding playback rpm, so I've been thinking in terms of concert pitch, which wouldn't be affected by shrinkage, instead of lateral pitch, i.e., the lines per inch, which certainly would. Since Edison's team used to refer to lines per inch as 'pitch', i.e. "2 minute pitch" or "a pitch of 100 lines per inch", etc., it's easy to get confused. It totally makes sense now. Musical pitch would indeed remain constant. Thanks to you both for the clarification! I guess we should be thankful that the amount of lateral shrinkage could never exceed the amount of play in most reproducers -- more foresight from our benevolent meisterinventor, or happy accident, who knows? :-) (Is it ironic that they cut at 97tpi for manufactured playback at 100tpi, and 100 yrs later it's probably closer to 97tpi?)
Best, Robert > Date: Tue, 12 Jul 2011 14:30:21 -0700 > From: majesticrec...@snet.net > To: phono-l@oldcrank.org > Subject: Re: [Phono-L] shrinking cylinder speed? > > This follows Robert's thoughts as well (I think). This is all about in-plane > shrinkage. So the original cylinder is longer to accommodate this shrinkage > and > the speed at which the cutter would move laterally across the cylinder would > have to be slightly faster. However, wouldn't the recording speed still be > 160rpm? > > Glenn >> From: rich-m...@octoxol.com>> To: phono-l@oldcrank.org>> Subject: Re: >> [Phono-L] shrinking cylinder speed?>>>> The pitch of the lead screw was >> adjusted for shrink for linear shrink. >> _______________________________________________ Phono-L mailing list http://phono-l.oldcrank.org
