Woltmann water current meter. 19th c Metal, copper,... Lot 488
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Not available
Estimate :
Subscribers only
Woltmann water current meter. 19th c Metal, copper, 26 x 20 x 7 cm. Unsigned. Wooden box. Woltmann reel with multi-bladed fan to measure flowing air and water. The forerunner to modern inferential meters and turbine meters!
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