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A thermometer having the bulb covered with a cloth, usually muslin or cambric, saturated with water.

Related Terms

SLING PSYCHROMETER

Measuring device with wet and dry bulb thermometers. Moved rapidly through air it measures humidity.

BULB

The name given to the temperature-sensing device located in the fluid for which control or indication is provided. The bulb may be liquidfilled, gas filled, or gas-and-liquid filled. Changes in temperature produce pressure changes within the bulb which are transmitted to the controller.

CAPILLARY TUBE

A tube of small internal diameter used as a liquid refrigerant flow control and pressure reducer between high and low pressure sides. Also used to transmit pressure from the sensitive bulb of some temperature controls to the operating element.

WET BULB DEPRESSION

Difference between dry bulb and wet bulb temperature.

BULBOUS BOW

Bows constructed with a bulb shaped projection rising from the bottom.

DELTA T

The dry bulb temperature less the wet bulb, it shows evaporation rate. Used by farmers for determining spraying conditions.

AIR THERMOMETER

A device that measures the temperature of an enclosed space by means of variations in the pressure or volume of air contained in a bulb placed in the space.

CALLENDAR'S COMPENSATED AIR THERMOMETER

A type of constant-pressure gas thermometer in which errors resulting from temperature differences between the thermometer bulb and the connecting tubes and manometer used to maintain constant pressure are eliminated by the configuration of the connecting tubes.

CUP-CASE THERMOMETER

Total-immersion type of thermometer with a cup container at the bulb end to hold a specified amount and depth of the material whose temperature is to be measured.

DANIELL HYGROMETER

An instrument for measuring dew point; dew forms on the surface Danjon prismatic astrolabe of a bulb containing ether which is cooled by evaporation into another bulb, the second bulb being cooled by the evaporation of ether on its outer surface.
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