Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 370
stone pillar which is set severalfeet in the ground, and rests upon a bed of concrete, ifthe soil is light. A house upon wheels, running upon atramway, is used to protect the instrument from theweather, and when in use this hut is run back to thenorth, leaving the siderostat exposed. In the north,… … 348 STARGAZING: PAST AND TRESENT. [book v. rods direct the mirror of the siderostat to almost anypart of the sky, viewing any object in the eyepieceof his telesco23e without altering his position. In spec-troscopy and celestial photography its use is of immenseimportance, for in these researches…
Astronomy · Telescopes
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