Engraving depicting Colvin's hydraulic milking machine: corrugated rubber suction cups were placed over the teats. Oscillating pumps gave the motion of a calf sucking, and created a partial vacuum, and the milk was drawn off into churns set in the floor. At the right of the picture the cow is being released from the stall, and the cups have been removed and swung out of the way and can be seen by the churn. Dated 19th Century
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Image Number: 1746-28997603Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:4907×4274
