helioscopen.
/ˈhiːlɪəʊskəʊp/ An apparatus for observing the sun without injury to the eye, or a telescope fitted with such an apparatus; the intensity of the light being reduced by smoked or coloured glass, by reflectors, or by other means.
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the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > sun
helioscope1675
heliostat1747
photoheliograph1862
photohelioscope1864
coronagraph1885
spectroheliograph1892
spectrohelioscope1906
spectroheliometer1973
1675 Philos. Trans. (Royal Soc.) 10 441 A Description of Helioscopes and some other instruments.
1762 J. Short in Philos. Trans. 1761 (Royal Soc.) 52 178 A reflecting telescope of 18 inches focus, with a helioscope adapted to it.
1869 T. L. Phipson tr. A. Guillemin Sun (1870) 85 What are called helioscopes, which are merely composed of two prisms, or two pieces of glass cut wedge-shaped, one white and transparent and the other black or coloured.
Derivatives
helioˈscopic adj. belonging to the helioscope, or to observation of the sun.
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1881 C. A. Young Sun 65 Other forms of helioscopic eyepiece.
heliˈoscopy n. the use of the helioscope, observation of the sun.
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1869 J. F. W. Herschel Outl. Astron. (ed. 10) iii. 75 Helioscopy.
This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2018).
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