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The art of measuring the distance of objects afar off. [Obs. or R.]

ining to an arc. Arcual measure of an angle (Math.), that in which the unit angle has its measuring arc equal to the radius of the circle.

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

The art or process of measuring the specific gravity of fluids.

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 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 consisting of a mass of wood or other material suspended as a pendulum, for measuring the force and velocity of projectiles by means of the arc through which their impact impels it.

untain barometer, a portable mercurial barometer with tripod support, and long scale, for measuring heights. -- Siphon barometer, a barometer having a tube bent like a hook with the longer leg closed at the top. The height of the mercury in the longer leg shows the pressure of the atmosphere. -- Wheel barometer, a ba…

An instrument for measuring depths, esp. one for taking soundings without a sounding line.

The art or science of sounding, or measuring depths in the sea.

The measuring of time by beating.

nsion; a bifilar balance. Bifilar micrometer (often called a bifilar), an instrument form measuring minute distances or angles by means of two very minute threads (usually spider lines), one of which, at least, is movable; -- more commonly called a filar micrometer.

A canvas for a portrait measuring 58 by 94 inches. The half bishop measures 45 of 56.

An instrument for measuring the bleaching power of chloride of lime and potash; a chlorometer. Ure.

An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance. S. P. Langley.

A device for checking motion, or for measuring friction. See Brake, n. 9 & 10.

of which live in artificial brines and in salt lakes. -- Brine gauge, an instrument for measuring the saltness of a liquid. -- Brine pan, a pit or pan of salt water, where salt is formed by cristallization. -- Brine pit, a salt spring or well, from which water is taken to be boiled or evaporated for making salt. -…