Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 349
coming to a ]joint, so that the star isseen on a bright field, and the wires as black lines. Nowif the star which is observed is a very faint one, wedefeat our own object, for the light coming from thelamp puts out the faint star. AVe have seen how the illumination of the wires, insteadof the… … Fig. 150.—Cookes illuminating lamp. side the wires in the micrometer so as to illuminate them.Messrs. Cooke and Sons have devised a lamp of very greatingenuity, Fig. 150. It is a lamp which does for theequatorial, in any position, exactly what the fixed lampdoes for the transit circle. It is…
Astronomy · Telescopes
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