Model of a Propeller, anonymous, anonymous, c. 1855 - c. 1860 Canvas Print
Model of a four-bladed screw that can be turned into a two-bladed one. The hub has a coupling piece with a ridge at the front, which indicates that the screw could be disconnected without sliding the propeller shaft into the ship. The front screw sits loose on a thread on the hub with just enough clearance to rotate ninety degrees; the rear screw is fixed by the hub with a pin. The pitch is 13.1 cm. Scale 1:20 (estimate).
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