des ; but the two - bladed screw A , Boss , b , Blade , c , Blade possesses a great advantage in being more showing thickness of metal . easily lifted for repair or inspection ; and in addition the “ well, ” as it is termed , that is cut down from the deck does not require to be so large . For war… … Fig . 361 . — Common Screw Propeller . b , Blade , c , Blade showing thickness of metal . A , Boss . they are generally cast along with the boss , of an elongated or spherical shape . The side view of the blade is quite parallel and more or less rounded at the point , and the thickness gradually…
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