Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 43
-^$S … Degens apparatus to lift the man and his flying mechanism with the aid ofa gas-balloon. See Chapter IV. direction in which it is blowing. Suppose the aero-naut wishes to sail in the opposite direction ? If the LAWS OF FLIGHT. 43 machinery will propel his airship only 10 miles anhour in a calm^ it…
Aeronautics
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