Image: Pentaspastos scheme
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Description: Scheme of an ancient Roman Pentaspastos crane ("Five-pulley-crane"). Being a medium-sized Roman crane, the Pentaspastos consisted of a single-beam jib, two winches, a rope, and a block containing five pulleys. Having thus a mechanical advantage of 5:1, the two men working the winch could raise loads of ca. 450 kg, assuming that 50 kg represent the maximum effort a man can exert over a longer time period.
Author: Eric Gaba (Sting - fr:Sting)
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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