entilator are has in the course of long years come about that the plants to a recognized science, to remain little more than a trade. a pair of 28 inches cylinders, Figs. 4 and 5, with 4 feet If, for instance, the same care were taken with the stroke, and provided with adjustable cut-off valves.… … @— = — 28, 0 — + - -3 tons with the ends of the ventilator pit. round plates of glass about the size of a watch crys- Ree EES tal, placed parallel and held about 4 inch apart by a Chilton Colliery is a new pit raising 800 tons of coal per day, and the present requirements in the metal strip, which…
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