Hypertext Webster Gateway: "Autotransformer"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Autotransformer \Au`to*trans*form"er\, n. [Auto- + transformer.]
(Elec.)
A transformer in which part of the primary winding is used as
a secondary winding, or vice versa; -- called also a
{compensator} or {balancing coil}.
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