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Working model after Leonardo da Vinci, Madrid Ms. I (BNM), fol. 44v
The external pulleys are fixed. The internal ones are driven by the crank toward the wheel's outer rim, moving the rods to which they are connected. As the rods straighten, they exert a traction force toward the center. Leonardo may have thought of using the machine for a textile-processing operation.
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Leonardo da Vinci
Stretching device