Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 224
re; and a few strips of draughtsmans tracingcloth. As the propeller is the most difficult part to make,it is best to begin with it. The flat blank is cut outof the whitewood, and subjected to the action ofsteam issuing from the spout of an actively boilingtea-kettle. The steam must be hot; mere…
Aeronautics
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