RecordWorm drive model (detail)< 1 of 1 > Back probably made in Paris
Worm drive model (detail)A worm drive demonstrates how simple gearing works between a screw and a cogged wheel. This worm drive model was made in the 19th century, probably by Breton and Freres, scientific instrument makers based in Paris. The worm drive is in the form of a screw, and in this apparatus is attached to an axle so that it can mesh into the teeth of a large cog-wheel. A small effort applied to the axle turns the cog-wheel, raising comparably heavier loads. At the top of the brass frame, the instrument is signed 'BRETON ET FS (?) / A PARIS'. This demonstrates the principle used in such machines as the vice or the jack, showing how something as small as a car jack can enable a wheel to be changed with very little effort expended by the car driver. Record detailsTo search on related items, click any linked text below.
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