Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 223
ts of a prism, P, to produce the spec-trum, a telescope, A, through which the spectrum is Viewed, soenlarged that only a small part of it is in the field of view at once,though by turning A around P5 all parts can be examined succes-sively, and, a telescope B to concentrate the light upon the… … Fig. 251. through this to the telescope A. This carries a small scale dividedinto millimetres, so that the observer can measure the exactposition of any color of the spectrum. 731. Each substance when made the source of light, asby dipping a platinum wire into some of it powdered ordissolved in…
Physics
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