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Of or pertaining to the psychrometer or psychrometry.

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

eat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf. [R.]

The nut of an Australian tree (Macadamia ternifolia). It is about an inch in diameter, and contains a single round edible seed, or sometimes two hemispherical seeds. So called from Queensland in Australia.

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

A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

ve a carrionlike odor, and are very large, in one species (Rafflesia Arnoldi) having a diameter of two or three feet.

To ratify. [Obs.] "To rate the truce." Chapman. To rate a chronometer, to ascertain the exact rate of its gain or loss as compared with true time, so as to make an allowance or computation depended thereon.

An observation read from the scale of a graduated instrument; as, the reading of a barometer. Reading of a bill (Legislation), its normal recital, by the proper officer, before the House which is to consider it.

e Ferchault de Réaumur; conformed to the scale adopted by Réaumur in graduating the thermometer he invented. -- n.

Specifically, the reaction or rebounding of a firearm when discharged. Recoil dynamometer (Gunnery), an instrument for measuring the force of the recoil of a firearm. -- Recoil escapement See the Note under Escapement.

and differing from the sextant chiefly in having an entire circle. -- Reflecting galvanometer, a galvanometer in which the deflections of the needle are read by means of a mirror attached to it, which reflects a ray of light or the image of a scale; -- called also mirror galvanometer. -- Reflecting goniometer. See u…

; -- applied to instruments; having an apparatus which registers; as, a registering thermometer. See Recording.

s seems to meet and interlace with another set in a different plane. -- Reticulated micrometer, a micrometer for an optical instrument, consisting of a reticule in the focus of an eyepiece. -- Reticulated work (Masonry), work constructed with diamond-shaped stones, or square stones placed diagonally.…

ngle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere.

Of or pertaining to a rheometer or rheometry. Lardner.

One who writes in rhythm, esp. in poetic rhythm or meter. [R.] One now scarce counted a rhythmer, formerly admitted for a poet. Fuller.

h a hood. -- Riding master, an instructor in horsemanship. -- Riding rhyme (Pros.), the meter of five accents, with couplet rhyme; -- probably so called from the mounted pilgrims described in the Canterbury Tales. Dr. Guest. -- Riding school, a school or place where the art of riding is taught.

mail made of small steel rings sewed upon a garment of leather or of cloth. -- Ring micrometer. (Astron.) See Circular micrometer, under Micrometer. -- Saturn's rings. See Saturn. -- Ring ousel. (Zoöl.) See Ousel. -- Ring parrot (Zoöl.), any one of several species of Old World parrakeets having a red ring around th…

quantity or bulk; to swell; as, a river rises in its bed; the mercury rises in the thermometer.