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in article , Adder at wrote
on 12/10/04 2:14 PM:

Multipole generators can do this, maybe they had not heard of more than 2?
poles back then

I must admit that I do not know for sure, but multipole alternators probably
came before the electrification of Niagra. Hydraulic turbines could not spin
at synchronous speed.

The trouble with multipole alternators is that they will be larger. Because
they turn slowly, they require more torque for the ame amount of power and,
therefore, must be built more ruggedly.

Bill