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Thanks, Howard, This comes out weird, as a parabola, not a curve. Is that intentional?" Steve -----Original Message----- From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Howard Sanner Sent: Saturday, January 26, 2019 1:04 PM To: [log in to unmask] Subject: [ARSCLIST] 50/60 Hz strobe speeds Here are the speeds on the strobe discs that accompany Aida Favia-Artsay's Caruso on Records. 50 Hz: 68.18 71.43 73.17 75.00 76.92 77.92 80.00 86.95 88.23 60 Hz: 67.92 71.29 73.47 75.00 76.60 78.26 80.00 86.75 87.80 There is also a good discussion of this in Michael Henstock's Fernando de Lucia, Son of Naples (which also happens to be the best example of musicological research I've ever seen). HTH. Howard Sanner [log in to unmask]