BLACK-BULB THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a metal envelope, frequently in the form of a Bourdon tube.

A thermometer in which the thermally sensitive element is a liquid contained in a graduated glass envelope; the indication of such a thermometer depends upon the difference between the coefficients of thermal expansion of the liquid and the glass; mercury and alcohol are liquids commonly used in meteorological thermometers.

A mode of control in which there is a continuous linear relation between value of the controller variable and position of the final control element (modulating control).

Area of rolling element changes. Inner race slowly creeps around shaft.

A condition of filter element loading in which contaminant spans the space between adjacent sections of a filter element, thus blocking a portion of the useful filtration.

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

A non-metallic element - No. 6 in the periodic table. Diamonds and graphite are pure forms of carbon. Carbon is a constituent of all organic compounds. It also occurs in combined form in many inorganic substances; i.e., carbon dioxide, limestone, etc.

The maximum specified inside-out differential pressure that can be applied to a filter element without outward structural or filter-medium failure.

A filter element which, when loaded, can be restored by a suitable process, to an acceptable percentage of its original dirt capacity.

A scale-forming element found in some boiler feedwaters.