Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 188
lade clamped to the bench at theright of the illustration—which shows a four-bladedpropeller, instead of the two-bladed type needed forthe monoplane. The propeller used for propulsion in air differsfrom the propeller-wheel used for ships in water,in that the blades are curved laterally; the… … 188 FLYING MACHINES: HOW TO BUILD. sion in the rear which adds to the holding power onthe substance of the air. It is extremely difficult todescribe this complex shape, and the amateur builderof a propeller will do well to inspect one made by aprofessional, or to buy it ready made with his engine.…
Aeronautics
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