Suspended thus on a thin layer of air, perhaps no more than a
sixteenth of an inch thick but infinitely less friction-producing than
the finest ball-bearing wheels and quite incapable of being broken,
the ship now waited only the application of the power in her vast
propellers.
"Let in numbers two and four," commanded the Master, suddenly, into
the engine-room telephone. "In five seconds after we start, hook up
one and three; and five later, the other two."
"Aye, aye, sir," came back the voice of Auchincloss, chief engineer.
"Ready, sir!"
Almost at once, the vibration of the engines altered, grew more
marked, seemed to be taking hold of something with strong but easy
effort. Another trembling made itself felt, as two of the giant
screws, connected by reducing-gears with the engine-shafting--all
three engines being geared to one shaft, but any one being capable of
separate running--began to revolve.
From astern, a dull, droning hum mounted, rose, grew rapidly in volume
and power. And, as two more screws began to whirl, the Eagle of the
Sky shook herself slightly. She awoke from slumber. Steadily, smoothly
on her air-cushions she began to move forward down the long, sloping
trackway to the brink of the cliff.
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