Re: [Phys-l] How Does a Tire Pressure Gage Work?

[Bernard Cleyet <bernardcleyet@redshift.com>]

The "absolute" P gauges use calibrated masses instead of a spring.  A 
company in Si valley surplused a set of masses in a wooden box to 
R.A.F.T., but not the cylinder, so I don't know the construction.  Have 
a nice box tho.

bc, who wonders if BW will disassemble his digital gauge. 

p.s. had to:

Scroll to Tire P. G.

http://school.nelson.com/elementary/science/bcscienceprobe/0176290605/teacher/weblinks.html

and dead weight tester

http://www.ravika.com/dead_weight_pressure.htm


Brian Whatcott wrote:

> I was surprised at the workings revealed, when the end fell
> off the tire gage  I was using.  Then I was surprised that
>  I was surprised.  The method is so intuitive.
>
> In a cylinder, place a rubber piston facing the air valve.
>  Its movement is resisted by a helical spring along the length
>  of the cylinder.  The piston's final position is indicated by
>  a plastic calibrated rule sticking out at the end.
> The piston is reset by pushing the rule back in.
>
>
> Brian Whatcott    Altus OK    Eureka! 
>
>
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