Troll plate

(Mach.) a rotative disk with spiral ribs or grooves, by which several pieces, as the jaws of a chuck, can be brought together or spread radially.

See also: Troll

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
He had invented a mechanism making it easier to engage and disengage a troll plate, a device that slows boats down for trolling.
A bucket of gold
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