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What does helioscope mean?

Looking for the meaning or definition of the word helioscope? Here's what it means.

Noun
  1. (astronomy) An apparatus for viewing the sun without harming the eye, by means of blackened glass or mirrors that reflect only a part of the light.
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A few words must here be said concerning the helioscope, which on more than one occasion played a prominent part in this war.

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