Engraving depicting a milking machine invented by Edward M. Knolling of Sandy Creek. In the glass globe (a) a partial vacuum was created by means of a pump (C ), four metal tips were inserted into the teats, and the milk drawn off by the vacuum in the globe. Dated 19th Century

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

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