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Path: utzoo!utcsri!ubc-vision!alberta!jim
From: jim@alberta.UUCP (Jim Easton)
Newsgroups: net.physics
Subject: Re: How Do Tire Guages Work?
Message-ID: <785@alberta.UUCP>
Date: Tue, 21-Jan-86 15:42:59 EST
Article-I.D.: alberta.785
Posted: Tue Jan 21 15:42:59 1986
Date-Received: Tue, 21-Jan-86 23:19:37 EST
References: <626@ttidcb.UUCP>
Organization: U. of Alberta, Edmonton, AB
Lines: 15

Dear Dick,

The funnest way of finding out how they work is to take one apart.  Some
are even built for it but I will tell you.

There is a spiral spring attached inside to the end which goes onto
the valve.  The other end of the spring is attached to a piston.  When
air comes into the cavity it pushes the piston down the tube, stretching
the spring, a distance proportional (approximately for the purists) to
the pressure.

The rod that comes out the other end of the gauge is a rider on the
piston and stays when the pressure is removed.

	Jim Easton (..!alberta!jim)