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We are confronted, in fact, with the same kind of problem which met the constructors of turbine steam-engines designed for electric lighting. The object was to get an initial speed which would be so great as to admit of the coupling of the dynamo to the revolving shaft of the turbine steam-motor, without the employment of too much reducing gear.
She hesitated and then flushed. The moon-jeep crunched and clanked loudly over the trail that led downhill. There was no sound outside, of course. There was no air. But the noise inside the moon-vehicle was notable. The steam-motor, in particular, made a highly individual racket. "I'd rather not say," said Babs awkwardly. "What's your own main feeling, Mr. Cochrane?" "Mine?" Cochrane grinned.
Once the great discoveries of the fifteenth century were made, especially that of the pressure of the atmosphere, supported by a series of advances in natural philosophy and they were made under the medieval city organization, once these discoveries were made, the invention of the steam-motor, and all the revolution which the conquest of a new power implied, had necessarily to follow.
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