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es, or displacements by means of the interference of two beams of light; -- called also refractometer.

directed; indisposed to be taught, disciplined, or tamed; violent; stubborn; obstinate; refractory; as, an intractable child.

Not capable of being exactly expressed by an integral number, or by a vulgar fraction; surd; -- said especially of roots. See Surd.

Not refrangible; that can not be refracted in passing from one medium to another. -- Ir`re*fran"gi*ble*ness, n.

A plane of fracture, or divisional plane, of a rock transverse to the stratification.

A silky wool derived from the seeds of Ceiba pentandra (syn. Eriodendron anfractuosum), a bombaceous tree of the East and West Indies.

One circuit around a race track, esp. when the distance is a small fraction of a mile; as, to run twenty laps; to win by three laps. See Lap, to fold, 2.

al pressure or stress. -- Lateral strength (Mech.), strength which resists a tendency to fracture arising from lateral pressure. -- Lateral system (Bridge Building), the system of horizontal braces (as between two vertical trusses) by which lateral stiffness is secured.

cs), the law that the volume of a given mass of gas increases or decreases, by a definite fraction of its value for a given rise or fall of temperature; -- sometimes less correctly styled Gay Lussac's law, or Dalton's law. -- Law of nations. See International law, under International. -- Law of nature. (a) A broad ge…

A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius.

g, and carrying the superincumbent weight by means of its strength in resisting crosswise fracture.

future. (b) (Navigation) Tables for correcting an observed lunar distance on account of refraction and parallax. -- Lunar year, the period of twelve lunar months, or 354 days, 8 hours, 48 minutes, and 34.38 seconds.

an object as seen by the naked eye (that is, unmagnified); as, a macrograph of a metallic fracture.

A standard of dimension; a fixed unit of quantity or extent; an extent or quantity in the fractions or multiples of which anything is estimated and stated; hence, a rule by which anything is adjusted or judged.

e instrument is large and equatorially mounted, it is known as a heliometer. -- Double refraction micrometer, a species of double image micrometer, in which the two images are formed by the double refraction of rock crystal. -- Filar, or Bifilar, micrometer. See under Bifilar. -- Micrometer caliper or gauge (Mech.),…

Thousandth; consisting of thousandth parts; as, millesimal fractions.

ly, one between a Roman Catholic and a Protestant. -- Mixed number, a whole number and a fraction taken together. -- Mixed train, a railway train containing both passenger and freight cars. -- Mixed voices (Mus.), voices of both males and females united in the same performance.

maine) formed in the decomposition of protagon with boiling baryta water, and in the putrefraction of proteid matter. It was for a long time considered identical with choline, a crystalline body originally obtained from bile. Chemically, however, choline is oxyethyl-trimethyl-ammonium hydroxide, while neurine is vinyl-…

The term in a fraction which indicates the number of fractional units that are taken.

Any number, proper or improper fraction, or incommensurable ratio. The term also includes any imaginary expression like m + nsq. root-1, where m and n are real numerics.