Egon, My original statement included these words... "By the way did I ever mention to you the many ways which, in theory, a desktop aneroid barometer could be employed to determine the height of a tall building?"

An aneroid barometer does not employ mercury or other column of liquid to perform its function. An aneroid barometer is essentially the same instrument as an altimeter but calibrated in units of pressure like bar, mm of Hg, inches of Hg, height of water column and the like as opposed to altitude in feet, meters, furlongs, rods, etc.

If you need more detail just send Dave a PM and he will explain it to you.

[img]/forums/images/icons/smile.gif[/img] Pat [img]/forums/images/icons/smile.gif[/img]