The scientific papers of Sir William Huggins (1909)
Huggins, William, Sir, 1824-1910, Huggins, Lady, d. 1915 · London, W. Wesley and son · leaf 231
is, induced me to attempt to combine in one instru-ment several simple prisms with one or two compound prisms which givedirect vision. An instrument constructed in this way, as will be seen fromthe following description, possesses several not unimportant advantages.* a is an adjustable slit ; b an… … Fig. 26. prisms, f, g, h. Each of the compound prisms contains five prisms, cementedtogether with Canada balsam. The shaded portions of the diagram representthe position of the two prisms of very dense flint glass in each compoundprism. The compound prism marked e is much larger than the other, and…
Astronomy
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