The scientific papers of Sir William Huggins (1909)
Huggins, William, Sir, 1824-1910, Huggins, Lady, d. 1915 · London, W. Wesley and son · leaf 497
or 4 inches, or at the placeof the eyepiece, when removed, an adjustable slit (a) is placed ; the object-glass is focussed upon the object on the stage so that its magnified image fallsprecisely upon the slit. The opening of the slit, which may be from -^joth to4^oth of an inch, allows the light of… … Fig. 54- ments, any portion of the object can be made to fall within the jaws of theslit and to form a separate spectrum. (See diagram.) Behind the slit, at its own focal distance, is placed an achromatic lens (b).The pencils emerge parallel, and then pass through one or more prisms (c).The pencils…
Astronomy
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