I have a flow gauge for a swimming pool filter system that was built sometime in the 1920's, it uses mercury as the indicator. It's from a YMCA. We sell them pool chemicals, etc. There's a newer filtration system there, so I swiped the gauge. They also used to have several huge coal boilers in place, not used anymore, they had been fitted with oil burners. A newer boiler was nearby, doing the work. They used the steam from the boilers to heat the pool, with a heat exchanger. The boilers have been since removed, but I did snag 2 pressure gauges. I'll post some photos later today.
Last edited by CoalHeat
on Sun Nov 18, 2007 6:23 pm, edited 1 time in total.