International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 436
^ of an inch of mercury. When the air has become sorarefied as this, the valve V will not lift, and, consequently,no more air can be exhausted. 1066. Sprengels Air Pump.—In Fig. 194, c d is a.glass tube longer than 30 inches, open at both ends, andconnected by means of India rubber tubing with a… … has a spout at the side a little higher than the lower end ofc d\ the upper part has a branch at x to which a receiverR can be tightly fixed. When the clamp at c is opened the first portions of the mercury which run outclose the tube and preventair from entering frombelow. These drops ofmercury act…
Railroad engineering
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