oth with great pressure between a pair of The valve has two cavities in its face, arranged one inadvance of the other, which as the vaive is recipro- powerful rollers. {cated alternately open the steain and exhaust passages rt Oo RAILROAD GATE. leading from the opposite ends of the cylinder. The… … BAIR’S RAILROAD GATE. will be pushed forward and downward, formed on the lower part of the inner surface of one of turning the shafts and causing the center the flanges slides between the flanges of the standard; a the valve is moved backward and forward over these These bars are of suchlength…
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