Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 167
he plane of the paper.Through this slit a thinline of light passes, andit is this thin line ofit light which is to beexamined in the spec-troscope. After pass-ing through s, the lightdiverges until it fallsupon an achromatic lensplaced at a. This lens is to be so placed that thedistance a s is… … Spectrum Analysis. 149 Let us now for a moment fix our attention upon therays of some particular colour. Suppose, for example,the red rays. The parallel beam of red rays will fallupon the prism p. Now, since each of these rays hasthe same colour, it will, on passing through the prism,be deflected…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
