Laboratory Commutators
Commutators were used as simple forward-off-reverse switches for electrical experiments in physics laboratories. There are two well-known historical types :
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Famous quotes containing the word laboratory:
“With all of its bad influences, T.V. is not to be feared.... It can be a fairly safe laboratory for confronting, seeing through, and thus being immunized against unhealthy values so as to be “in the world but not of it.””
—Polly Berrien Berends (20th century)