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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: The balloon observer is generally equipped with various
instruments, such as telescope, photographic cameras, and so
forth, so as to be able, if necessary, to prepare a topographical
survey of the country below. By this means the absence of
reliable maps may be remedied, or if not regarded, as
sufficiently correct they may be checked and counter-checked by
the data gained aloft.
Seeing that the gas has to be transported in cylinders, which are
weighty, it is incumbent that the waste of this commodity should
be reduced to the minimum. The balloon cannot be deflated at
night and re-inflated in the morning--it must be maintained in
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