Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 473
of different spectra. The instrument has received many im-provements and modifications, but the essential parts are one or moreprisms; a slit, through which the light to be examined is allowed to enter; atube, having at the other end a lens to render parallel the rays from the slit;a telescope,… … SPECTRA. THE SPECTROSCOPE. 423 represented in Fig. 219. It has a single pri3m,madeof glass, of great powerin dispersing the rays. The prism is supported on a Httle stage, placed in themiddle of a horizontal circular brass table about 6 in. in diameter. On theleft is seen a tube, about 15 in. long,…
Inventions
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