〓〓に推進器を有する渡船の推進に就いて
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概要
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Under the above subject, following cases were treated : - (a) The propellers at both ends were working at the same revolutions, where two sets of propellers- (1) with blades of the normal circular back sections, (2) with blades of the symmetrical sections of circular arc-were dealt with. (b) The after propeller was working, the forward propeller being left to rotate freely. (c) With the forward propeller removed, a single propeller aft was working.