Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 373
ing balloons in the field^and of restoring gas lost by leakage. The advent of the dirigible has engaged the activeattention of the war departments of all the civilized 372 MILITARY AERONAUTICS. nations, and experiments are constantly progressing,in many instances in secret. It is a fact at… … The German military non-rigid dirigible Parseval II. It survived the stormwhich wrecked the Zeppelin II in April, 1910, and reached its shed atCologne in safety. minum, v^hich is out of date since the discovery ofits lighter alloys. Practically all the armies are being provided withfleets of…
Aeronautics
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