pulley

pulley

A wheel grooved on its circumference to retain a rope or line. The weight of an eight-day clock is usually hung from a pulley. The line passes from the barrel round the pulley and is attached to the seat board. This arrangement halves the weight's fall, but demands a weight twice as heavy to drive the clock as one hung directly from the line without using a pulley.

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Industry/Domain: Chronometry
Category: Clock
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