that theydidnt intend to do it. 53 air and the other gas. Valves in the pipes regulatethe flow. The upper ends of the pipes, A and B, sup-port a valve casing in which a valve-plug is mountedto turn. The valve-plug, as shown in the smallerfigure, is formed with two annular ports, one of whichis… … A SIMPLE CHAIN-STOPPER. pacific Ocean; the mean temperature of the water inthis locality is 55 degrees. Thus within a distance of50 miles in a horizontal direction there is frequentlya difference of 50 degrees in temperature, where ina vertical direction there is often a difference of 30degrees in…
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