Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 422
the upper portions of the prisms ; it is thenthrown down by the reflecting prism seen behind thecollimator, then, returning along the lower part, it is ruAT. xxvii.] THE CHEMISTRY OF THE STARS. 399 .ject- received by a right-angled prism in front of theglass of the observing telescope. Instead of… … Fid 177.—Spectroscope ■\vitli retuniiiit; Beam. fall is silvered ; the rays then are returned on them-selves, and, when the instrument is adjusted, come to afocus on the inside of the slit plate, forming there aspectrum, any part of which can, by moving the prisms,be made to fall on a small…
Astronomy · Telescopes
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