| The wet-test meter in the picture is in the Kenyon College
collection. It was bought as part of an apparatus to measure the heating
power of gas.
From the 1941 Central Scientific Company catalogue: "Gas
Meters, Wet Test, Cubic Foot, for precise measurements of gas volumes
in the determination of the heating values of gases for the determination
of the amounts of impurities, such as dust, tar, moisture, etc., carried
by the gas. Each meter is checked against a 1/10 cubic foot bottle certified
by the Natural Bureau of Standards and is guaranteed to be accurate to
with ½ percent in normal operation." There were two models: the
one that measured a maximum flow rate of 20 cubic feet per hour was $75,
and one with two and a half times the capacity was $110.