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ordinary height is about 30 inches (760 millimeters). See Sympiesometer. Nichol. Aneroid barometer. See Aneroid barometer, under Aneroid. -- Marine barometer, a barometer with tube contracted at bottom to prevent rapid oscillations of the mercury, and suspended in gimbals from an arm or support on shipboard. -- Moun…

An instrument for determining the depth of the sea water by its pressure.

An instrument for indicating the level of water in a distant tank or reservior.

An instrument for determining altitudes by the boiling point of water.

A barometer in which the changes of atmospheric pressure are indicated by the motion of a column of water instead of mercury. It requires a column of water about thirty-three feet in height.

Containing no liquid; -- said of kind of barometer. Aneroid barometer, a barometer the action of which depends on the varying pressure of the atmosphere upon the elastic top of a metallic box (shaped like a watch) from which the air has been exhausted. An index shows the variation of pressure.

certain physical measurements calculations; conventionally, that pressure under which the barometer stands at 760 millimeters, at a temperature of 0º Centigrade, at the level of the sea, and in the latitude of Paris. Sir W. Thomson.

pertaining to weight, esp. to the weight or pressure of the atmosphere as measured by the barometer.

An aneroid barometer for use with accompanying graphic diagrams and printed directions designed to aid mariners to interpret the indications of the barometer so as to determine the existence of a violent storm at a distance of several hundred miles.

Pertaining to the barometer; made or indicated by a barometer; as, barometric changes; barometrical observations.

By means of a barometer, or according to barometric observations.

A form of barometer so constructed as to inscribe of itself upon paper a record of the variations of atmospheric pressure.

s, and for the same liquid under different pressures. For water, at the level of the sea, barometer 30 in., it is 212 º Fahrenheit; for alcohol, 172.96º; for ether, 94.8º; for mercury, about 675º. The boiling point of water is lowered one degree Fahrenheit for about 550 feet of ascent above the level of the sea. -- Bo…

gravity; to drop; to sink; as, the apple falls; the tide falls; the mercury falls in the barometer. I beheld Satan as lightning fall from heaven. Luke x. 18.

ge, an instrument for determining the height of the tides. -- Vacuum gauge, a species of barometer for determining the relative elasticities of the vapor in the condenser of a steam engine and the air. -- Water gauge. (a) A contrivance for indicating the height of a water surface, as in a steam boiler; as by a gauge…

r permitting a body to incline freely in all directions, or for suspending anything, as a barometer, ship's compass, chronometer, etc., so that it will remain plumb, or level, when its support is tipped, as by the rolling of a ship. It consists of a ring in which the body can turn on an axis through a diameter of the r…

A weatherglass; a barometer.

Wholly solid; -- said of a barometer constructed of solid materials to show the variations of atmospheric pressure without the use of liquids, as the aneroid.

rried out, by means of an implement or implements. The chief mechanical requisites of the barometer are implemented in such an instrument as the following. Nichol.

A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line. [Written also isobare.]