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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Aeroplanes and Dirigibles of War by Frederick A. Talbot: still another set which has been perfected by the Marconi
Company. This is the "knapsack" set, in which the whole of the
installation, necessarily light, small, and compact, is divided
among four men, and carried in the manner of knapsacks upon their
backs. Although necessarily of limited radius, such an
installation is adequate for communication within the restricted
range of air-craft.
Greater difficulties have to be overcome in the mounting of a
wireless installation upon a dirigible. When the Zeppelin was
finally accepted by the German Government, the military
authorities emphasised the great part which wireless telegraphy
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