A liquid-in-glass or liquid-in-metal thermometer using mercury as the liquid.

The actual lifting force of an inflated balloon, usually expressed in grams.

An instrument used for measuring the specific gravity of a liquid.

A type of instrument shelter. It is a wooden box painted white with double louvered sides and mounted on a stand four feet above the ground.

An instrument for measuring the extinction coefficient in water.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

A temperature scale with the ice point at 273 degrees and boiling point of water at 373 degrees. It is intended to approximate the Kelvin temperature scale with sufficient accuracy for many sciences, notably meteorology.

A measure of the intrinsic luminous intensity emitted by a source in a given direction. Luminance is a measure only of light. The comparable term for electromagnetic radiation in general is radiance.

A motorlike device containing a rotor and a stator and capable of converting an angular position into an electrical signal, or an electrical signal into an angular position. When several synchros are correctly connected, all of the rotors will align thems ...

Same as atmometer.

A standard interface between a computer input/output port and a peripheral device. Signal properties including time duration, voltage. and current, are specified by the Electronic Industries Association.

An instrument for determining the dust content of a sample of air. Also spelled conimeter.

A hydrostatic principle that pressure supplied to an enclosed fluid is transmitted undiminished to every portion of the fluid and to the walls of the containing vessel.

The total area drained by a river and its tributaries. Same as river basin.

A unit of luminance (or brightness) equal to 1/6 candles per square centimeter.

Same as photometer.

The height of the cloud base above the local terrain.

A device that combines several separate communications signals into one and outputs them on a single line.

See calorie.

Interational thermometric scale on which the freezing point of water equals 0