Chapter

 1 II  |    heavier than the air,” flying machines, aerial ships, or what not.
 2 III | introduced by Henry Giffard, the machines of Dupuy de Lome in 1872,
 3 III |  important results. But if these machines, moving in a medium heavier
 4 III |          nine yards a second—the machines had remained almost stationary.
 5 III |      second. The dynamo-electric machines of Captain Krebs and Renard
 6 IV  |           progress is for flying machines. The bird flies, and he
 7 VII |      heavier than air, to flying machines in imitation of the birds,
 8 VII |        and Guidotti, the idea of machines made to move through the
 9 VII |    George Cauley with his flying machines driven by gas. From 1854
10 VII |        could experiment with the machines, of which many were patented.
11 VII |          perfected, their flying machines, ready to do their work,
12 VII |  vertical axes.~2. Ornithopters, machines which endeavour to reproduce
13 VIII|          of aerial locomotion by machines heavier than air?”~It would
14 XVI |         required for working his machines? He must have some retreat,
15 XXI |        boasted of the marvels of machines heavier than air, and raised
16 XXII|    probably the work done by the machines would be very much less
17 XXII|       less than that done by the machines of the “Albatross.”~The “