International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 437
ong as the hemispheres contain air, theycan be separated with ease; but when theair in^ the interior is pumped out bymeans of an air pump, they can be sepa-rated only with great difficulty. Theforce required to separate them will beequal to the area of the largest circle ofthe hemisphere (projected… … Fig. 195. 1069. The W^eight Lifter.—The pressure of theatmosphere is very clearly shown by means of an apparatuslike that illustrated in Fig. 196. Here, a cylinder fittedwith a piston is held in suspension by a chain. At the top ofthe cylinder is a plug A, which can be taken out. Thisplug is…
Railroad engineering
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