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
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