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An instrument for measuring temperature, founded on the principle that changes of temperature in bodies are accompained by proportional changes in their volumes or dimensions.

An instrument for examining the thermal resistance or heat- conducting power of liquids.

A thermometer specially constructed for measuring temperetures at a depth below the surface of the ground.

, a thermometer for recording the lowest temperature since its last adjustment.

An apparatus for determining the temperature of a distant point, as by a thermoelectric circuit or otherwise.

A thermometer by merely inverting which the temperature may be registered. The column of mercury is broken and, as it remains until the instrument is reset, the reading may be made at leisure.

A thermometer filled with water instead of mercury, for ascertaining the precise temperature at which water attains its maximum density. This is about 39º Fahr., or 4º Centigrade; and from that point down to 32º Fahr., or 0º Centigrade, or the freezing point, it expands.

That one of the two similar thermometers of a psychrometer the bulb of which is moistened; also, the entire instrument.

An instrument consisting in part of a differential thermometer. It is used for measuring changes of temperature produced by different conditions of the sky, as when clear or clouded.

e relation of a point or position in a series, or of degree, rate, or value; as, with the thermometer at 80º; goods sold at a cheap price; a country estimated at 10,000 square miles; life is short at the longest.

ally, if the system of accounts be complete and the balances correctly taken. -- Balance thermometer, a thermometer mounted as a balance so that the movement of the mercurial column changes the indication of the tube. With the aid of electrical or mechanical devices adapted to it, it is used for the automatic regulati…

An expansion or protuberance on a stem or tube, as the bulb of a thermometer, which may be of any form, as spherical, cylindrical, curved, etc. Tomlinson.

To ascertain the caliber of, as of a thermometer tube; also, more generally, to determine or rectify the graduation of, as of the various standards or graduated instruments.

The process of estimating the caliber a tube, as of a thermometer tube, in order to graduate it to a scale of degrees; also, more generally, the determination of the true value of the spaces in any graduated instrument.

The Celsius thermometer or scale, so called from Anders Celsius, a Swedish astronomer, who invented it. It is the same as the centigrade thermometer or scale.

ed into a hundred divisions or equal parts. Spesifically: of or pertaining the centigrade thermometer; as, 10° centigrade (or 10° C.). Centigrade thermometer, a thermometer having the zero or 0 at the point indicating the freezing state of water, and the distance between that and the point indicating the boiling state…

A thermometer for the measurement of low temperatures, esp. such an instrument containing alcohol or some other liquid of a lower freezing point than mercury.

A division, space, or interval, marked on a mathematical or other instrument, as on a thermometer.

Affected by slight causes; showing slight changes; as, a delicate thermometer.

produced equal to the difference of the motions of the component screws. -- Differential thermometer, a thermometer usually with a U-shaped tube terminating in two air bulbs, and containing a colored liquid, used for indicating the difference between the temperatures to which the two bulbs are exposed, by the change o…