- a telescope for viewing the sun, adapted to protect the eye of the viewer from the sun's glare.
Origin of helioscope
Examples from the Web for helioscope
Historical Examples of helioscope
To the "helioscope" employed by Father Scheiner two centuries and a quarter earlier, a species of micrometer was added.A Popular History of Astronomy During the Nineteenth Century
Agnes M. (Agnes Mary) Clerke
A few words must here be said concerning the helioscope, which on more than one occasion played a prominent part in this war.The Story of the Zulu Campaign