ese chests slide cylindrical valves, whose rims open rest of the bolt was tempered straw color. The bolt and close the inlet and the outlet ports alternately, the ing, to the turning and drilling machines. The latter head was similarly hardened and tempered. valves having each a central hub and… … bers, all absolutely identical. This was thus alternately opening and closing the out- PABTBIDGE'S WATEB MOTOB. let and inlet ports in each chamber. A prac- so far from being the case that no die, tical test of this improvement has been made before no drill, and no milling cutter actually made two…
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