163 BOOK VI . } … A — Upright axle . B — Block . C — Roof beam . D — Wheel . E — Toothed - drum . F — Horizontal axle . G — Drum composed of rundles . H — Drawing rope . I — Pole . K — Upright posts . L — Cleats on the wheel . wheel made of thick planks joined firmly together , and at its upper end a toothed drum ;…
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