. The Family tutor . Fig. i4. NATURAL PHILOSOPHY. 35. evidently leave a vacuum below it wei-e it not that the air in the globe, exerting itselastic force, pushes up the valve, c, and expands into the cylinder. In this way,therefore, by the upward movement of the piston, a certain quaiitity of air comes outof the globe and fills the cylinder. The piston is now depressed : the moment it begins to descend, the valve, c, which leads intothe globe shuts; and now^ as the piston coniesdown it condenses the air below it, and as this airis condensed, it resists exerting its elastic piston-val
. The Family tutor . Fig. i4. NATURAL PHILOSOPHY. 35. evidently leave a vacuum below it wei-e it not that the air in the globe, exerting itselastic force, pushes up the valve, c, and expands into the cylinder. In this way,therefore, by the upward movement of the piston, a certain quaiitity of air comes outof the globe and fills the cylinder. The piston is now depressed : the moment it begins to descend, the valve, c, which leads intothe globe shuts; and now^ as the piston coniesdown it condenses the air below it, and as this airis condensed, it resists exerting its elastic piston-valve, p, under these circumstances, ispushed open, and the compressed air gets away intothe atmosphere. As soon as the piston has reachedthe bottom of the cylinder, all the air has escaped,and the process is repeated precisely as before. Theaction in the syringe is, therefore, to draw out fromthe globe a certain quantity of air at each upwardmovement, and expel this quantity into the air ateach downward movement. For reasons connected with the great p
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Keywords: ., bookcentury1800, bookdecade1850, bookpublisherlondo, bookyear1851
