Chapter

 1 II  |        thousand five hundred cubic meters that pass over Niagara in
 2 III |          Géant? Six thousand cubic meters. How large was John Wise’
 3 III |     balloon? Twenty thousand cubic meters. How large was the Giffard
 4 III |         Twenty-five thousand cubic meters. Compare these three aerostats
 5 III |            to forty thousand cubic meters, and you will understand
 6 IV  | ascensional movement of forty-five meters a second, a man can support
 7 IV  |       speed be increased to ninety meters, he can walk on it with
 8 IV  |           have to fill fifty cubic meters with his warm fluid merely
 9 IX  |       centigrade for every seventy meters of elevation the temperature
10 XXII|         Go-Ahead” was 40,000 cubic meters, the ascensional power of