Andy Dingley <
[email protected]> wrote in message
news:<
[email protected]>...
> On 16 Apr 2003 21:49:36 GMT,
[email protected] wrote:
>> What's a manometer?
> A translation error.
>> Some kind of device to measure tyre pressure?
> It _compares_ two pressures, usually (a U tube manometer) by using a tall U -shaped tube filled
> with a liquid. For tyre pressures, even using mercury, this thing would be the size of a house !
Manometer implies a precision laboratory-grade instrument much like chronometer implies a more
percise instrument than a clock. At least in medical fields aneroid manometers are more common
than mercury ones though mercury spygmomanometers have the advantage that they are accurate and
don't wear out.
1 mmHg or torr is 0.019PSI so a 120PSI would be 6316 mmHg. To measure this with a mercury
manometer would require a tall one but it would not have to be large. A few years ago I gave away
a bottle of mercury. If I still had it I might attempt to make such a device. I don't think it
would be practical for daily tire checking though it might be nice to check the accuracy of my
tire pressure gauges.
best, Bruce
--
Bruce Jackson - Sr. Systems Progrrammer - DMSP, a M/A/R/C Group company