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The Alexander Column
Glossary
Block and tackle - a device used to exert pulling (lifting)
force, consisting of a fixed block and a moving block, each of which contains
a number of pulleys. A rope or cable is fixed at one end, and then looped
alternately around the pulleys in the moving and fixed blocks. Pulling
on the free end of the cable brings the two blocks closer together, exerting
a lifting force on the load attached to the moving block. The mechanical
advantage (disregarding friction) is directly proportional to the number
of pulleys in the system.
Capstan - a type of windlass with a vertical drum used, for example,
on ships to haul up the anchor.
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