Agricola, Georgius
,
De re metallica
,
1912/1950
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31 - 60
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241 - 270
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421 - 450
451 - 480
481 - 510
511 - 540
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90
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<
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>A—UPRIGHT AXLE. B—BLOCK. C—ROOF BEAM. D—WHEEL. E—TOOTHED-DRUM.
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F—HORIZONTAL AXLE. G—DRUM COMPOSED OF RUNDLES. H—DRAWING ROPE.
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I—POLE. K—UPRIGHT POSTS. L—CLEATS ON THE WHEEL.
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wheel made of thick planks joined firmly together, and at its upper end a
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toothed drum; this toothed drum turns another drum made of rundles, which
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is on a horizontal axle. </
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<
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>A winding-rope is wound around this latter axle,
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which turns in iron bearings set in the beams. </
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<
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>So that they may not fall, the
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two workmen grasp with their hands a pole fixed to two upright posts, and
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then pushing the cleats of the lower wheel backward with their feet, they
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revolve the machine; as often as they have drawn up and emptied one
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bucket full of excavated material, they turn the machine in the opposite
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direction and draw out another.</
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main
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>The fourth machine raises burdens once and a half as large again as the
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two machines first explained. </
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<
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>When it is made, sixteen beams are erected
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each forty feet long, one foot thick and one foot wide, joined at the top with
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clamps and widely separated at the bottom. </
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<
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>The lower ends of all of
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them are mortised into separate sills laid flat upon the ground; these sills
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are five feet long, a foot and a half wide, and a foot thick. </
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<
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>Each beam is also
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connected with its sill by a post, whose upper end is mortised into the beam </
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</
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body
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