n. [ Gr. &unr_; double + &unr_; image + -scope. ] (Astron.) An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is on the meridian. [ 1913 Webster ]

n. [ Gr. e'i^dos form + graph. ] An instrument for copying drawings on the same or a different scale; a form of the pantograph. [ 1913 Webster ]

‖n. [ NL., fr. Gr. &unr_; image. See Idol. ] An image or representation; a form; a phantom; an apparition. Sir W. Scott. [ 1913 Webster ]

{ } [ Gr. &unr_; beautiful + &unr_; appearance, form + &unr_; sound. ] (Physics.) An instrument invented by Professor Wheatstone, consisting of a reflecting knob at the end of a vibrating rod or thin plate, for making visible, in the motion of a point of light reflected from the knob, the paths or curves corresponding with the musical notes produced by the vibrations. [ 1913 Webster ]

n. [ Gr. &unr_; beautiful + e'i^dos form + -scope. ] An instrument invented by Sir David Brewster, which contains loose fragments of colored glass, etc., and reflecting surfaces so arranged that changes of position exhibit its contents in an endless variety of beautiful colors and symmetrical forms. It has been much employed in arts of design. [ 1913 Webster ]

Shifting like the fragments of colored glass in the kaleidoscope. G. W. Cable.

{ } a. Of, pertaining to, or formed by, a kaleidoscope; variegated. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, voice + e'i^dos form + -scope. ] (Physics) An instrument, consisting of a tube having one end open and the other end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singing into it. A. E. Dolbear. [ 1913 Webster ]

n. [ Phono- + Gr. e'i^dos form + -scope. ] (Physics) An instrument for studying the motions of sounding bodies by optical means. It consists of a tube across the end of which is stretched a film of soap solution thin enough to give colored bands, the form and position of which are affected by sonorous vibrations. [ 1913 Webster ]