Aëronautics: an abridgment of aëronautical specifications filed at the Patent Office from A. D. 1815 to A. D. 1891 (1893)
Brewer, Griffith, comp, Alexander, Patrick Y., joint comp, Great Britain. Patent Office · London, Taylor and Francis · leaf 147
136 A.D. 1891. No. 4485. NAHL, Perham Wiluelm. "Navigable Balloon." An elongated balloon, constructed in separate compartments, is provided with an aeroplane on either side, which increase in width towards the stern. Two propellers, one on either side of the balloon, are actuated by electric… … enables their position to be adjusted by means of a hand wheel. A rod which is fulcrumed below the balloon carries a hollow ball at its lower end containing sand, and by adjusting this rod forward or backward the angle of the balloon may be adjusted. By opening a valve at the lower part of the…
Aeronautics
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