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 for hydrogen to replace what is lost by the daily play of condensation and dilatation. Having a gas capacity of 1257 cubic metres (nearly 45,000 cubic feet) it possesses twice the lifting power of my "No. 6," in which the Deutsch prize was won; and such is the necessary weight of its 60 horse-power, water-cooled, four-cylinder motor and its proportionally strong machinery that I shall probably take up no more ballast in it than I took up in the "No. 6." Comparing their sizes and lifting powers, it would make five of

My "No. 9," the novel little "runabout," which I shall describe in the succeeding chapter. The third of the new air-ships is

My "No. 10," which has been called "The Omnibus." Its gas capacity of 2010 cubic metres (nearly 80,000 cubic feet) makes its balloon greater in size and lifting power than even the racing "No. 7"; and should I, indeed, desire at any time to shift to it the latter's keel, all furnished with the racing motor and machinery, I might combine a very swift air craft capable of carrying myself, several aids and a large supply of both petroleum and ballast—not to speak of war munitions were the sudden need of a belligerent character.

The prime purpose of my "No. 10," however,