The record made by a hygrograph.

The record made by a hygrograph.

A hygrometer which includes an arrangement for the time recording of atmospheric humidity.

A hygrometer which includes an arrangement for the time recording of atmospheric humidity.

An instrument used to measure the water vapor content of the air.

An instrument used to measure the water vapor content of the air.

An instrument that shows changes in humidity.

An instrument that shows changes in humidity.

Readily taking up and retaining moisture.

Readily taking up and retaining moisture.

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

Apparatus using the combined simultaneous action of a bimetallic thermometer and a hair hygrometer to move a needle in front of a divided scale. fts construction permits dew point variations to be indicated approximately.

Apparatus using the combined simultaneous action of a bimetallic thermometer and a hair hygrometer to move a needle in front of a divided scale. fts construction permits dew point variations to be indicated approximately.

An instrument used to determine atmospheric pressure or elevation by observing the boiling point of water or both liquids. The sensitivity of the hypsometer increases with decreasing pressure, making it more useful for high altitude work.

An instrument used to determine atmospheric pressure or elevation by observing the boiling point of water or both liquids. The sensitivity of the hypsometer increases with decreasing pressure, making it more useful for high altitude work.

The maximum difference in output for any given input (within the specified range) when the value is approached first with increasing, and then with decreasing, input signals. Caused by energy absorption in the elements of the measuring instrument. Usually ...

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

A type of precipitation composed of unbranched crystals in the form of needles, columns, or plates. Usually has a very slight downward motion and may fall from a cloudless sky.