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The impression of diminutiveness and inadequacy of power passed away, however, when the professor informed his companions that the vapour would enter the high-pressure cylinder at the astounding pressure of five thousand pounds to the square inch, and that, though the engines themselves would only make fifty revolutions per minute, the propeller, would be made, by means of speed-multiplying gear, to revolve at the rate of one thousand times per minute in air of ordinary atmospheric pressure.
But the impression of diminutiveness and inadequacy of power merged into one of astonishment nearly approaching incredulity when the professor casually mentioned that the vapour by which the engines were driven entered the high-pressure cylinder at the astounding pressure of five thousand pounds to the square inch, and that, although the engines themselves made only fifty revolutions per minute, the main shaft, to which the propeller was attached, made, by means of speed-multiplying gear, no fewer than one thousand revolutions per minute in air of ordinary atmospheric pressure!
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