Crushing gold bearing ores in mills similar in principle to flour mills, 1556. At bottom left goats in a treadmill produce horizontal power which is transferred to a mill (A) through a crown-and-pinion. At bottom right men turn a capstan and power is transferred through a tooth-and-pinion. From De re metallica by Georgius Agricola. (Basel, 1556). (Photo by Ann Ronan Pictures/Print Collector/Getty Images)
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January 27th, 2021
Viewed 50 Times - Last Visitor from Cupertino, CA on 09/11/2021 at 1:17 AM