The Royal observatory, Greenwich. A glance at its history and work (1900)
Maunder, E. Walter (Edward Walter), 1851-1928 · London, The Religious tract society · leaf 257
nts, so even more directly the sunhimself makes register of his changes by the sameagency, and gives us at once his portrait and hisautograph. This new department was again due to Airy, andin 1873 the Kew photo-heliograph, which had beendesigned by De la Rue for this work, was installedat… … THE HELIOGRAPHIC DEPARTMENT 255 and even that is usually diminished by a cap to threeinches, and its focal length is but five feet. This isnot very much larger than what is commonly calleda students telescope/ but it is amply sufficient forits work. This Dallmeyer telescope, so called from thename…
Royal Greenwich Observatory · Astronomy
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