| 31. | The Medvedevs rigged spars, pulleys and hooks to reel in fish.
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| 32. | Belts, pulleys and gears connect it to different devices.
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| 33. | Hill's plywood perch with the help of a pulley system.
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| 34. | As the string is drawn back, the pulleys rotate.
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| 35. | He may also have pulled up food in buckets via a pulley.
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| 36. | As the chain moves into the pulleys the contact area gets smaller.
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| 37. | A larger moment arm reduces the force needed to rotate a pulley.
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| 38. | Pulleys several feet in diameter are used at the top and bottom.
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| 39. | Manufacture of ships'pulley Richard Roberts and Joseph Whitworth.
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| 40. | Aggressive exercises such as overhead pulleys should be avoided with this population.
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