Search the Dictionary

That branch of science which treats of the measurement of the intensity of light.

eying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

That department of meteorology that treats of the measurement of the precipitation of rain, snow, etc.

Measurement of the capacity of the lungs for air. Dunglison.

Pertaining to, or obtained by, the pyrometer; as, pyrometrical instruments; pyrometrical measurements.

The use of the radiometer, or the measurement of radiation. -- Ra`di*o*met"ric (#), a.

The preparation of the facts and measurements of observations in order to deduce a general result.

dex. -- Refraction circle (Opt.), an instrument provided with a graduated circle for the measurement of refraction. -- Refraction of latitude, longitude, declination, right ascension, etc., the change in the apparent latitude, longitude, etc., of a heavenly body, due to the effect of atmospheric refraction. -- Terre…

limb, before reading off the aggregate result, which aggregate, divided by the number of measurements, gives the angle, freed in a measure from errors of eccentricity and graduation. -- Repeating watch. See Repeater (a)

The measurement of an angle by successive observations with a repeating instrument.

is photographed, by a separate exposure, on the same plate with star images to facilitate measurements, detect changes of the film, etc.

The measurement of the force or intensity of currents.

- Lag screw. See under Lag. -- Micrometer screw, a screw with fine threads, used for the measurement of very small spaces. -- Right and left screw, a screw having threads upon the opposite ends which wind in opposite directions. -- Screw alley. See Shaft alley, under Shaft. -- Screw bean. (Bot.) (a) The curious spi…

or pertaining to seismometry, or seismometer; as, seismometric instruments; seismometric measurements.

The act of shrinking; a contraction into less bulk or measurement.

measurement by sounding; also, the depth so ascertained.

A spectroscope fitted for measurements of the luminious spectra observed with it.

al instruments; -- used for determining the exact position of objects and making delicate measurements. Fine wires, silk fibers, or lines on glass similarly placed, are called spider lines. -- Spider mite. (Zoöl.) (a) Any one of several species of parasitic mites of the genus Argas and allied genera. See Argas. (b) An…

ne used for itinerary distances, also adopted by the Romans for nautical and astronomical measurements. It was equal to 600 Greek or 625 Roman feet, or 125 Roman paces, or to 606 feet 9 inches English. This was also called the Olympic stadium, as being the exact length of the foot-race course at Olympia. Dr. W. Smith.…

teps, or paces; hence, to divide, as a space, or to form a series of marks, by successive measurements, as with dividers.