Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 486
inter of the new arrangement pos-sesses this great advantage—that itdoes not illuminate the whole fieldof view. If a dark wire were used, the brightdiffused light would almost obscurethe faint light of the spectra, and en-tirely prevent the possibility of see-ing, let alone measuring, the position… … Fig. 225.—Section of Micro-Spectro-scope with Micrometer. THE SPECTROSCOPE. 435 the tube. Under these circumstances the limits of correction for the pathof the rays in their passage through the dispersing prisms are very limitedand must be strictly observed. The usual method of correcting by the…
Inventions
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