ant by a valve. A valve is just atightly litting trap-door that closes a hole, and thatcan only open in one way—upwards, for instance.You have, most of you, seen trap-doors in Hoors thatopen upwards. Now in the figure you see to the lefta bell-jar full of air, which fits tightly upon a plate.You… … n,, V, or plug that can move up and down in the cylinderor barrel. Finally you see two valves or small and tightlyfitting trap-doors, one of which is placed where thetube enters the bottom of the cylinder, while theother is in the piston itself. Both of these valvesopen iipwards and not downwards.…
Physics
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