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: "allena...@aol.com" <allena...@aol.com> To: phono-l@oldcrank.org Sent: Tue, July 12, 2011 4:34:21 PM Subject: Re: [Phono-L] shrinking cylinder speed? In a message dated 7/12/2011 3:56:12 P.M. Eastern Daylight Time, esrobe...@hotmail.com writes: I've never heard of this. Must be a fascinating read. Where did you hear about cylinders being recorded at a different speed than the intended playback? ---------------- that has to be the case because the physical (molded) cylinders sold to the public are not the identical cylinders that were mastered. There are usual a couple of steps, generating sub-masters, and each step causes shrinkage of the resulting cylinder as it comes out of the mold. A 2-minute style Edison wax cylinder would probably be recorded around 97+ tpi when it was in the studio, and in two interim steps, result in a 100 tpi final gold-molded version sold to his customers. It is an interesting question as to the parallel impact on the subsequent rpm's. Allen _www.phonobooks.com_ (http://www.phonobooks.com) _______________________________________________ Phono-L mailing list http://phono-l.oldcrank.org _______________________________________________ Phono-L mailing list http://phono-l.oldcrank.org
