Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 299
thermo-couple of the radiomicrometer M. The central zones of thetwo lenses are covered by circular discs of black paper a^ anda.,, 25 mm. in diameter. A movable shutter D is used to cutoff the radiation at will. The distance of the lenses from thecircular aperture are so arranged that a -sharp… … dotted lines. Owing to the very much smaller indices ofrefraction for the light waves and short heat waves it is evidentthat these, after emerging from the lens L, will form a divergentcone shown by the fine dotted lines in the diagram. The centralportion of this cone, such as would otherwise fall…
Spectrum analysis
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