From: "J. G. Locke" <lockejg@redshift.com>
How about filling a long tube with vacuum pump oil?
of the oil would be visible. The bottom of the tube would sit in a tub of
some sort (like the Hg barometers).
So, how to read the instrument? from a second (or third) story? with
a
telescope? put the tub of oil in the basement?
|| -----Original Message-----
|| Subject: Barometers
|| Does anyone have suggestions on building barometers? For obvious
|| reasons, I have to avoid using Mercury. What other fluids work
well?
We once tried making such a barometer using a 40-foot water-filled pipe
made of lengths of glass and rubber tubing from the chem lab. The tube
extended from the roof of our four story school building to the ground
below. We suggest that others try this technique also.
The major problem that we had was filling the tube and keep it from
leaking near the bottom where the pressure was the greatest.
Herb Gottlieb from New York City
(Where vacuum oil is more expensive and less dense than water)