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John William Mackenzie
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1162. Mackenzie, J. W., [Shaw, R. W.]. Jan. 20. Screw propellers.-In order that a screw propeller may be equally efficient when driven ahead or astern, it consists of two helical parts 7, 7 of half a turn each, having the two ends 4, 5 cupped in opposite directions, the part of the edge 6 joining these two cupped parts being disposed transversely to the propeller shaft.
GB190501162D1905-01-201905-01-20Improvements in Propellers.
ExpiredGB190501162A
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