1) Optical device
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https://www.crosswordclues.com/clue/dipleidoscope
A dipleidoscope is an instrument used to determine true noon. It consists of a small telescope and a prism that creates a double image of the sun. When the two images overlap, it is local true noon. The instrument is capable of determining true noon to within ten seconds. The dipleidoscope was invented by Giovanni Battista Amici in the first half ...
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http://en.wikipedia.org/wiki/Dipleidoscope
instrument for measuring moment when an object passes a meridian
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http://phrontistery.info/d.html
• (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.Di...
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http://thinkexist.com/dictionary/meaning/dipleidoscope/
<astronomy, instrument> 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 ...
Found on
http://www.encyclo.co.uk/local/20973
Di·plei'do·scope noun [ Greek ... double + ... 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 ar...
Found on
http://www.encyclo.co.uk/webster/D/70
A dipleidoscope is 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 g...
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http://www.probertencyclopaedia.com/browse/GD.HTM
No exact match found.
