on in other arrangements with two or more blades of greater surface in each ; but it is obvious that it is not nearly so strong as the ordinary mode of construction , and therefore more liable to get damaged . We now notice a form of pro - peller which has been exten - sively used both in the royal… … Fig . 366 . — Four - bladed Propeller cast on Fig . 365 . — Boss for a Six - bladed Feathering the Boss . Propeller . a , Boss , b , Blade , c , Taper on shaft . a , Boss , b , Blade . c , Key . d , Wedge D , Nut with split pin . pieces . e e , Plates . or nearly so ; the points and that portion…
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