Peter L. Peres wrote:
>http://www.antiquewireless.org/otb/60cycles.htm

Yes different freq is optimal for different purposes.

IIRC still railways around here use 16 2/3 Hz.

Some industries use 400Hz to drive efficient compact motors (i.e durable handheld heavy duty AC motor power tools) (50Hz motor of same power would have been too heavy)

Amazingly even very large generators of 600MW now run at 3000rpm direct on steam turbine shaft.  (nuclear plant)  Impressive.

Just wondering why USA settled for 60Hz while most of the world settled for 50Hz?
And also different voltage.  We dropped the last 127 and 110 Volts decades ago...

... And the TV systems ... ;)

/Morgan

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