Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 420
ay, that it shall be in theposition of minimum deviation, wdien the angles ofincidence and emergence are equal, and each surfacerefracts the ray equally. They can be arranged so, thatas the telescope is moved to observe a new part of thespectrum, every prism will be automatically adjusted. CHAP.… … Vui. Hi.—Automatic bi)octios>coije (Giubbs iorni). There is another arrangement which is very simple,in which we get the condition of minimum deviation bymerely mounting the prisms on a spring, and then
Astronomy · Telescopes
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