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An instrument for measuring the amount of carbonic acid in a mixture.

A modification of the quadrant, for measuring small angles. [Obs.]

A nonmotile gamete, found in certain lower algæ.

An instrument for measuring the height of objects. Knight.

See Areometer.

An instrument for measuring the specific gravity of fluids; a form hydrometer.

A calculating machine.

The investigation of the relation between the sun, moon, and stars, and the weather. -- As`*tro*me`te*or`o*log"ic*al, a. -- As`tro*me`te*or*ol"o*gist, n.

An instrument for comparing the relative amount of the light of stars.

A photometer for measuring the brightness of stars.

An instrument for measuring the evaporation from water, ice, or snow. Brande & C.

An instrument for measuring the rate of evaporation from a moist surface; an evaporometer. Huxley.

An instrument by which the power of hearing can be gauged and recorded on a scale.

An instrument to measure the growth of plants. Goodale.

An instrument for measuring the magnifying power of a lens or system of lenses.

An apparatus for measuring or determining the proportion of nitrogen; a nitrometer.

An instrument for determining the delicacy of the sense of pressure. -- Bar`æs*the`si*o*met"ric, Bar`es*the`si*o*met"ric (#), a.

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.

An instrument for ascertaining the weight and length of a newborn infant.

e atmospheric pressure. At the sea level its 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 f…