[Ian Iveson]

videochas wrote:

*****
Only if the vertical modulation was not used. Cylinders
were made by
the Edison company, and they consisted of a series of peaks
and
valleys. That doesn't work well for high frequencies
because the
stylus doesn't have time to fall back into the valley before
the next
peak comes along.

*****

Why not? Ratio of sprung to unsprung weight must be high for
both lateral and vertical tracking. There should be no
difference in terms of max acceleration, surely? But maybe
gravity contributes to even harmonics at low frequency?

Ian

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