| 释义 |
helioscope|ˈhiːlɪəʊskəʊp|
[a. F. hélioscope (1671 in Hatz.-Darm.), f. helio- + -scope.]
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.
1675Phil. Trans. X. 441 A Description of Helioscopes and some other instruments. 1761Short Ibid. LII. 178 A reflecting telescope of 18 inches focus, with a helioscope adapted to it. 1869T. L. Phipson tr. Guillemin's 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.
So helioˈscopic a., belonging to the helioscope, or to observation of the sun; heliˈoscopy, the use of the helioscope, observation of the sun.
1869Herschel Astron. iii. (ed. 10) 75 Helioscopy. 1881C. A. Young Sun 65 Other forms of helioscopic eyepiece. |