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  • Webster's Revised Unabridged Dictionary
    • n Dipleidoscope (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.
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Century Dictionary and Cyclopedia
    • n dipleidoscope An instrument for indicating the passage of the sun or a star over the meridian by the coincidence of two images of the object, the one formed by single and the other by double reflection. It consists of an equilateral hollow prism, two of whose sides are silvered on the inside so as to be mirrors, while the third is formed of glass. The prism is adjusted so that one of the silvered sides shall be exactly in the plane of the meridian, and the transparent side toward the object. So long as the object has not reached the meridian, the image produced by that portion of the rays reflected directly from the glass surface, and that produced by the rays transmitted through the glass to the silvered side, reflected from it to the other, and thence through the glass, are not coincident, but gradually approach as the sun or star approaches the meridian, until they exactly coincide at the instant the center of the object is on the meridian; then an eye stationed at the side of the prism and looking toward the transparent side sees only one object.
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Chambers's Twentieth Century Dictionary
    • n Dipleidoscope di-plī′dō-skōp an instrument for ascertaining the moment of passage of the sun or a star over the meridian.
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Webster's Revised Unabridged Dictionary
Gr. double + image + -scope,
Chambers's Twentieth Century Dictionary
Formed from Gr. diploos, double, eidos, appearance, skopein, to view.