helioscope

Definitions

noun A form of telescope fitted for viewing the sun without pain or injury to the eyes, as an instrument made with colored glasses or glasses blackened by smoke, or with mirrors formed simply of surfaces of transparent glass, which reflect but a small proportion of light.

noun (Astron.) A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light.

helio- + -scope

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Modern telescopes on display include a helioscope, which is used to observe the sun because it can't be viewed directly through a telescope.

unknown title 2009
To the "helioscope" employed by Father Scheiner [414] two centuries and a quarter earlier, a species of micrometer was added.

A Popular History of Astronomy During the Nineteenth Century Fourth Edition 1874
Hippo-hopparray helioscope flashed winsor places as the gates might see.

Finnegans Wake 2006
Each insect, wakened but an hour ago by the warmth of the moist soil, in an abandonment of the moment, is a helioscope transmitting signals of pure pleasure.

Tropic Days 2003
According to Poggendorf, the invention of the helioscope is ascribed to him.

The Catholic Encyclopedia, Volume 3: Brownson-Clairvaux 1840-1916 1913
He made use of a helioscope composed of coloured glasses in the beginning, but afterwards conceived the idea of projecting the sun's image on a screen in order to study its surface.

The Catholic Encyclopedia, Volume 13: Revelation-Stock 1840-1916 1913
Each insect, wakened but an hour ago by the warmth of the moist soil, in an abandonment of the moment, is a helioscope transmitting signals of pure pleasure.

Tropic Days 1887
(1610-1616), who, with the helioscope invented by him, discovered the sun spots and calculated the ime of the sun's rotation; and the poet,

The Catholic Encyclopedia, Volume 8: Infamy-Lapparent 1840-1916 1913