Illustration from Theatrum Machinarum Novum 1661 by Georg Andreas Böckler; A human powered milling machine

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Illustration from Theatrum Machinarum Novum 1661 by Georg Andreas Böckler; A human powered milling machine; The machine is powered by two men on a large wheel treadmill

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Size: 4136px × 3048px
Photo credit: © Timewatch Images / Alamy / Afripics
License: Licensed
Model Released: No

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