Thesaurus: dipleidoscope

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1. n. 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.
2. 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.
3. An instrument for determining the time of apparent noon. Itconsists of two mirrors and a plane glass disposed in the form of aprism, so that, by the reflections of the sun's rays from theirsurfaces, two images are presented to the eye, moving in oppositedirections, and coinciding at the instant the sun's center is on themeridian.