Equation box

a system of differential gearing used in spinning machines for regulating the twist of the yarn. It resembles gearing used in equation clocks for showing apparent time.

See also: Equation

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Pedagogical features include equation boxes, practical tips, and a glossary with 250 definitions, plus an annotated example of a 23-page published research report.