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5Thus, when the levers are raised, the piston-rods are depressed to the bottom of the barrel, and the dolphins turning on their pivots, suffer the valves attached to them to descend, thus filling with air the cavities of the barrels. Lastly; the pistons in the barrels being alternately raised and depressed with a quick motion, cause the valves to stop the upper holes: the air, therefore, which is pent, escapes into the pipes, through which it passes into the wind-chest, and thence, by its neck, to the box.
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