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

A self-recording psychrometer.

A recording anemometer.

The indicating part of an instrument. For example, the hand of a watch or the meniscus of a mercury column.

An instrument which automatically records the voltage applied to it, as a function of time.

Same as dew-point hygrometer.

A modification of the dew cell used in radiosonde equipment.

A description or explanation of the manner in which the height of the ceiling is determined, i.e. aircraft ceiling, balloon ceiling. estimated ceiling, indefinite ceiling, measured ceiling, precipitation ceiling.

An instrument for rapidly obtaining samples of airborne dust; a type of dust counter. Particles pass through a cylindrical chamber, are drawn at high velocity through a narrow slit, and then impinge upon a microscope cover glass located a short distance f ...

The humidity transducinu element in a Diamond-Hinman radiosonde. Also called electrolytic strip.

A current meter consisting of six conical cups, mounted around a vertical axis, which rotate and generate a signal with each rotation. Tail vanes and a heavy weight stabilize the instrument.

Same as atmometer.

The maximum distance, usually horizontally, at which a given object or light source is just visible under particular conditions of transmittance and background luminance.

The part of a measuring instrument which responds directly to changes in the environment.

The lowest level at which the wind becomes geostrophic in the theory of the Ekman spiral. Also called gradient wind level.

The time required for an instrument to registe 63.2% of a step change in the variable being measured.

The processing of the form or mode of a signal so as to make it intelligible to, or compatible with, a given device.

A recording hair hygrometer.

Read Only Memory. A memory that cannot be altered in normal use of a computer, Usually used to store information permanently, such as firmware programs.

The transducer's output when the maximum sensed value is applied to the transducer's input. For example, the F.S. output of a 4-20 mA transmitter is 20 mA, whereas its span is only 16mA.