way improved . With the view of arriving at the best pitch for propelling the vessel , the designer of this form generally prefers the blades cast separate from the boss , and all keyed to it by a key passing through a shank accurately turned to fit a corresponding hole in the boss ; the flange has… … Fig . 367 . — Feathering Propellers . Fig . 368 . — Boss for Feathering Propeller . a , Boss , b , Taper on shaft . c , Nut and split pin . A , Boss . B , Blades . d , Key . e , Wedge pieces . f , Plate . G , Plate fitted to hole for putring in the key . adopted . All these screws are either fitted…
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