International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 436
on from Rgoes on, the mercury risesin the tube c d until, whenthe exhaustion is complete,it forms a continuous col-umn 30 inches high; inother words, it is a barom-eter, whose Torricellian^^- ^^- vacuum is the receiver R. This instrument necessarily requires a great deal of time forits operation,… … PNEUMATICS. 425 1067. Note.—A theoretically perfect vacuum is sometimescalled a Torricellian vacuum. 1068. Magdeburg Hemisplieres.—By means ofthe two hemispheres shown in Fig. 195, it can be proventhat the atmosphere presses upon a body equally in all direc-tions. They were invented by Otto Von…
Railroad engineering
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