In this manner an antenna from 40 to 50 feet in
height may be obtained.
The feature of this set is its compactness, the equal division of
the sections of the installation, and the celerity with which the
station may be set up and dismantled in extremely mountainous
country such as the Vosges, where it is even difficult for a
pack-horse to climb to commanding or suitable positions, there is
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
was destined to play in connection with such craft. But have
these anticipations been fulfilled? By no means, as a little
reflection will suffice to prove.
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