Draining mine workings with a bank of three suction pumps. As the men turn the shaft the cams, B, connect with tappets. A, on the piston rods, C. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut.
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Creative#:
TOP09159536
Source:
達志影像
Authorization Type:
RM
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須由TPG 完整授權
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