Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 240
^j>asss3g3ygwx^^ X^ro30;S33»SS3W3»^^ \A^ … D F T Ao A is shown a method of mounting the propeller with a glass or china bead toreduce friction, and a brass corner to aid in strengthening. B shows atransmission of power by two spur wheels and chain. C is a device forusing two rubber twists acting on the two spur wheels S, S, which in turn…
Aeronautics
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