e water into the cylinder. When the piston is depressed the valve C is closed, the water already in forces H open, and passing through the piston, reaches the cylinder and the spout (fig. 55). The hand fire-engine depends upon the action of compressed air, which is so compressed by pumping water… … Fig. 55.— The Pump. is because the slight cushion of air in the upper part of the vase is compressed, and the little water thus caused to enter the nut shell makes it heavier, and it descends with the figure (fig. 56). We have now seen that air is a gas, that it exercises pressure, that it…
Scientific recreations
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