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From: wasser@viking.DEC (John A. Wasser)
Newsgroups: net.physics
Subject: Tire Pressure Guage
Message-ID: <574@decwrl.DEC.COM>
Date: Mon, 20-Jan-86 09:30:34 EST
Article-I.D.: decwrl.574
Posted: Mon Jan 20 09:30:34 1986
Date-Received: Wed, 22-Jan-86 05:19:30 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 16



	Air pressure pushes against a piston that compresses a spring.
	As the piston moves it pushes the calibrated rod out the top.
	When the spring pressure matches the air pressure, the motion
	stops (equilibrium).  When the guage is removed, the spring 
	goes back but the rod is held in place by friction until pushed 
	back into the guage by hand.

	Experiment:  While the guage is still pressed to the tire,
	push in on the rod.  Do you feel the air pressure?  Good.
			-John A. Wasser

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