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Flexible rods the period of vibration of which in two planes at right angles are in some exact ratio to one another. When one end of such a rod is fixed, the free end describes in vibrating the corresponding Lissajous figure. So called because devised by Sir Charles Wheatstone.

rometer. -- Wheel boat, a boat with wheels, to be used either on water or upon inclined planes or railways. -- Wheel bug (Zoöl.), a large North American hemipterous insect (Prionidus cristatus) which sucks the blood of other insects. So named from the curious shape of the prothorax. -- Wheel carriage, a carriage mov…

A plane used by coopers for evening chines.

Any planet or heavenly body, especially when considered as inhabited, and as the scene of interests analogous with human interests; as, a plurality of worlds. "Lord of the worlds above." I. Watts. Amongst innumerable stars, that shone Star distant, but high-hand seemed other worlds. Milton. There may be other worlds, w…

The system made up of a force and a couple of forces in a plane perpendicular to that force. Any number of forces acting at any points upon a rigid body may be compounded so as to be equivalent to a wrench. Carriage wrench, a wrench adapted for removing or tightening the nuts that confine the wheels on the axles, or fo…

A narrow lane or alley. [Scot.] Jamieson. The narrow wynds, or alleys, on each side of the street. Bryant.

The time in which any planet completes a revolution about the sun; as, the year of Jupiter or of Saturn.

Of or pertaining to the zodiac; situated within the zodiac; as, the zodiacal planets. Zodiacal light, a luminous tract of the sky, of an elongated, triangular figure, lying near the ecliptic, its base being on the horizon, and its apex at varying altitudes. It is to be seen only in the evening, after twilight, and in t…

zones. Zonal equation (Crystallog.), the mathematical relation which belongs to all the planes of a zone, and expresses their common position with reference to the axes. -- Zonal structure (Crystallog.), a structure characterized by the arrangements of color, inclusions, etc., of a crystal in parallel or concentric l…

Divided by parallel planes; as, zonate tetraspores, found in certain red algæ.

The portion of the surface of a sphere included between two parallel planes; the portion of a surface of revolution included between two planes perpendicular to the axis. Davies & Peck (Math. Dict.)

or parts of organisms, capable of division into two symmetrical halves only in a single plane.