Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

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

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!