Regnaults Hygrometer
“It consists of a glass tube or capsule A, having on the bottom and a little way up a highly polished silver surface, and closed by a cork with two holes. through one of these holes the stem of a thermometer B passes, having its bulb at the bottom of the silvered capsule, and the other end may, if desired, be connected with an aspirator or air-pump. In making an observation as much either is introduced into the capsule A as will cover the bulb of the thermometer, and then by transmitting air through the tube C the ether vapor is withdrawn from the capsule A through another tube D.” — Encyclopedia Britannica, 1893
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MeteorologySource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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