Original caption: Copper engraving by Stradanus of iron clocks. The iron wheel turns evenly, and evenly discloses those times and these. These clocks pre-date the pendulm clock which wasn't known for another half century. Those shown here are operated by weights. The two machinists at the left are fashioning gears by hand, while the back central figure pumps the bellows for the forge. Undated.
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