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 297
uld require many hours to determine atthe transit instrument. But the positions of thesestars on the plate still remain to be measured. Forthis purpose a net-work of lines, at right angles toeach other, is printed on the photograph before itsdevelopment, and, after it has been developed, washedand… … THE DRIVING CLOCK OF THE ASTROGRAPHIC TELESCOPE. {Reproduced from Engineering by permission.) THE ASTROGRAPHIC DEPARTMENT 295 In fact, in each of the two series of photographs thewhole sky is taken twice, but the two photographsof any region are not simply duplicates of eachother. The centre of…
Royal Greenwich Observatory · Astronomy
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