An instrument for indicating variations in the density of the atmosphere; a kind of barometer.

a mercurial barometer having a float attached to a string passing over a pulley-wheel on which the index turns.

†(a) a hydrometer used to measure the concentration of alcohol in spirits (obsolete rare); (b) a barometer in which atmospheric pressure is shown…

A form of barometer in which the column of liquid in the tube has above it a body of confined air or other gas (instead of a vacuum as in the…

= barograph, n.

An aneroid barometer.

A barometer constructed on the aneroid principle, actuating mechanism which records automatically the variations in atmospheric pressure.

Used attributively or in the possessive to designate a type of mercury barometer invented by Fortin.

a telemetric instrument for graphically recording atmospheric pressure; cf. barograph, n.

a telemetric instrument for indicating atmospheric pressure; a barometer that receives or transmits measurements using telemetry.

a telemetric instrument for indicating the depth of a column of water based on the water pressure at the bottom; a hydrobarometer that receives…

An instrument that uses an aneroid barometer to produce a graphical record of variations in air pressure. See aneroid, adj. 1a.

a form of aneroid barometer for indicating very small changes in atmospheric pressure (rather than measuring the pressure itself), formerly used…

An aneroid barometer with diagrams and directions for detecting the existence of a storm at a distance of several hundred miles.