Description
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!
488
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!