Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 500
to fix manypoints on the lunar surface. Still, although we can thusfix these and use them as so many points of the firstorder, as one might say, in a triangulation, there is muchthat photography cannot do; the work of the eye CHAr. XXXIII.] CELESTIAL PHOTOGRAPHY. 477 observer would be essential in… … Fig. 214.—The same Region copieil from a Photograph by De La Rtie. The light of the moon is so feeble in blue rays thata long exposure is necessary for a large image, andduring the exposure all the errors in the rate of theclock are magnified. We need not enlarge on the extreme importance ofwhat…
Astronomy · Telescopes
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