or are to a recognized science, to remain little more than a trade. a pair.of 38 inches cylinders. Figs. 4 and 5, with 4 feet has in the course of long years come about that the plants If, for instance, the same care were taken with the stroke, and provided with adjustable cut-off valves.… … coal per day, and the present requirements in the metal strip, which passes between them, dividing ROOTS' BLOWER FOR MINE VENTILATION.-Fig. 5 way of ventilation are amply met by running the the space between them into two sections. In the ventilator at fifteen revolutions per minute, giving lower…
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