Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 484
eing still so short (Ath of a second) that nothing is lostfrom the disturbances of the air. A telescope with this addition is called a photohelio-graph. The first instrument of this kind was devisedby Mr. De La Eue, and for many years was regularly em-ployed in taking photographs of the sun at Kew.… … Fic. 211.—Photoheliogrnph as erected in a Temporary (_)bservatory iorPhotogiaphing the Trausit of Venus in 1874. Professor Winlock obtained pliotograplis of the siiuwhich have surpassed the hmits of Mr. Newalls re- 46i STARGAZING : PAST AND PRESENT. [book vi, fractor; the negatives have a good…
Astronomy · Telescopes
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