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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: reaction between slaked lime and zinc, and so forth.
But the drawbacks to every process, especially upon the field of
battle, when operations have to be conducted under extreme
difficulties and at high pressure, were speedily recognised.
While other nations concentrated their energies upon the
simplification of hydrogen-manufacturing apparatus for use upon
the battle-field, Great Britain abandoned all such processes in
toto. Our military organisation preferred to carry out the
production of the necessary gas at a convenient manufacturing
centre and to transport it, stored in steel cylinders under
pressure, to the actual scene of operations. The method proved a
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