eter. They were four innumber—two of them ‘“‘up” Mr. Demenge, and received with much favor in France. Fig. tubes, as they are called, worked by exhausting the air and 1 shows a stationary engine. The steam enters the smaller making a vacuum. and two of them ‘‘down” tubes, worked highpressure… … engine, which has a capacity of 75 nected with that of the low pressure horse power, but which is never called cylinder in such a manner that it acts upon for half its resources. An engi- only during one quarter of the revolu- neer and four boys at the tubes are all tion, commencing just when the…
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