Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 207
ypes the cylinders are stationary,and turn the propeller shaft either by cranks or bygearing. An entirely distinct type of engine, and one whichhas been devised solely for the aeroplane, is the ro-tative—often miscalled the rotary, which is totallydifferent. The rotative type may be illustrated…
Aeronautics
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