hydroscope


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hydroscope

[′hī·drə‚skōp]
(optics)
An instrument designed to observe objects an appreciable distance below the surface of water, consisting of a series of mirrors enclosed in a steel tube.
References in periodicals archive ?
Boykin, "Living with Wetlands," Hydroscope (21:3, 1990): 6-9.
Cyril, patriarch of Alexandria, specialized in pogroms and belongs in Dante's Inferno for what he did to Hypatia, the last great scientist of the Neoplatonist era, who invented the astrolabe and hydroscope.
That what she knew about hydroscopes and astrolabes she probably got from her father, Theon, who got it from Ptolemy, and what they used them for, anyway, was fortune-telling.