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A telescope for observing the sun that protects the observer's eyes from the sun's glare.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an astronomical telescope adapted for visual observations of the surface of the sun. Dark filters, silvered objectives, and special helioscopic eyepieces are used to diminish the brightness of the solar disk, making it possible to decrease the amount of light striking the eye. At the present time helioscopes play a secondary role since research on the sun is done largely by photographic methods.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
CAST's expanded search is now looking for other low-energy particles, including other weakly-interacting particles from the dark energy spectrum, such as "solar chameleons." Meanwhile, a new, much larger and more sensitive axion helioscope, called IAXO, has been proposed, to be built using data and learnings from CAST.
stakes-performing mare Doll Ina (by Helioscope) and equally hardy stakes-placed Whistling Kettle (by Court Martial).
Randa Aboul-Hosn, -Press photo CAIRO - 19 January 2019: JW Marriott Cairo is proud to celebrate the launch of the first advanced solar-powered photovoltaic (PV) Modeling softwares, the Helioscope and PVSyst, that uses Solar power to convert the sun's rays into electrical energy.