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ight perpendicular to the perspective plane. -- Principal section (Crystallog.), a plane passing through the optical axis of a crystal.

Probate, a court for the probate of wills. -- Probate duty, a government tax on property passing by will. [Eng.]

Etym: [from H. Deacon, who introduced it] (Chem.), a method of obtaining chlorine gas by passing hydrochloric acid gas over heated slag which has been previously saturated with a solution of some metallic salt, as sulphate of copper. -- Final process (Practice), a writ of execution in an action at law. Burrill. -- I…

To shape the outline of an object by passing a cutter around it. Profiling machine, a jigging machine.

to offer as a toast or a health in the manner of drinking, that is, by drinking first and passing the cup. [Obs.] The lovely sorceress mixed, and to the prince Health, peace, and joy propined. C. Smart.

The noise in the throat produced by the air in passing through mucus which the lungs are unable to expel; -- chiefly observable at the approach of death, when it is called the death rattle. See Râle. To spring a rattle, to cause it to sound. -- Yellow rattle (Bot.), a yellow-flowered herb (Rhinanthus Crista- galli), t…

One of a system of diverging lines passing through a point, and regarded as extending indefinitely in both directions. See Half-ray. Bundle of rays. (Geom.) See Pencil of rays, below. -- Extraordinary ray (Opt.), that one or two parts of a ray divided by double refraction which does not follow the ordinary law of refr…

The influence of a coil of wire upon an alternating current passing through it, tending to choke or diminish the current, or the similar influence of a condenser; inductive resistance. Reactance is measured in ohms. The reactance of a circuit is equal to the component of the impressed electro-motive force at right angl…

The enacting or passing of a law a second time; the renewal of a law.

To break the natural course of, as rays of light orr heat, when passing from one transparent medium to another of different density; to cause to deviate from a direct course by an action distinct from reflection; as, a dense medium refrcts the rays of light as they pass into it from a rare medium.

io of the sine of the angle of incidence to the sine of the angle of refraction for a ray passing out of one of the media into the other.

acting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens.

Capable of being refracted, or turned out of a direct course, in passing from one medium to another, as rays of light. -- Re*fran"gi*ble*ness, n.

ition of a river with respect to the rate of its flow, as measured by the volume of water passing different cross sections in a given time, uniform régime being the condition when the flow is equal and uniform at all the cross sections. The ancient régime, or Ancien régime Etym: [F.], the former political and social sy…

A machine for registering automatically the number of persons passing through a gateway, fares taken, etc.; a telltale.

The act of passing back; passage back; return; retrogression. "The progress or regress of man". F. Harrison.

The act of passing back or returning; retrogression; retrogradation. Sir T. Browne. Edge of regression (of a surface) (Geom.), the line along which a surface turns back upon itself; -- called also a cuspidal edge. -- Regression point (Geom.), a cusp.

Passing back; returning.

the current in one circuit is made to open or close another circuit in which a current is passing. Relay battery (Elec.), the local battery which is brought into use by the action of the relay magnet, or relay.

To pass or go back; to move back; as, troops passing and repassing before our eyes.