Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 239
ounting of propeller showing glass bead next the thrust-block, and one leather washer outside the screw; B, glass bead; C, tinwasher; M, M, tin lugs holding axle of wheels. 238 MODEL FLYING MACHINES, The propeller in this instance is formed from apiece of very thin tin^ snch as is used for the tops…
Aeronautics
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