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A device for measuring the difference in phase of two alternating currents of electromotive forces.

An instrument for measuring sounds, as to their intensity, or the frequency of the vibrations.

bserving the phosphorescence produced in different bodies by the action of light, and for measuring its duration.

Art of recording or measuring intervals of time by the photochronograph. -- Pho`to*chron`o*graph"ic (#), -graph"ic*al (#), a. -- -graph"ic*al*ly, adv.

A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.

An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.

An instrument for measuring vocal sounds. Whewell.

An instrument for measuring the compressibility of liquids.

An instrument for measuring the area of any plane figure, however irregular, by passing a tracer around the bounding line; a platometer.

An apparatus for measuring the capacity of condensers, or the inductive capacity of dielectrics.

An instrument for measuring the amount of force exerted by the lungs in respiration.

The act or process of measuring, at the various distances from the surface of a block of marble, the surface of a future piece of statuary; also, a process used in cutting the statue from the artist's model.

The art or process of measuring the polarization of light.

A measuring stick; also, a measure of length equal to 5 Bacon. Pole bean (Bot.), any kind of bean which is customarily trained on poles, as the scarlet runner or the Lima bean. -- Pole flounder (Zoöl.), a large deep-water flounder (Glyptocephalus cynoglossus), native of the northern coasts of Europe and America, and m…

-- Position micrometer, a micrometer applied to the tube of an astronomical telescope for measuring angles of position in the field of view. -- Single position (Arith.), the method of solving problems, in which the result obtained by operating with an assumed number is to the true result as the number assumed is to th…

An instrument for measuring or comparing electrial potentials or electro-motive forces.

A mathematical instrument for laying down and measuring angles on paper, used in drawing or in plotting. It is of various forms, semicircular, rectangular, or circular.

The art of measuring the duration of mental processes, or of determining the time relations of mental phenomena. -- Psy`cho*met"ric, a.

An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.

An instrument for measuring the size of the pupil of the pupil of the eye.