Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 231
sliding diaphragmis placed over the slit for use with the light of the sun, in orderto stop ^own the solar image, as otherwise the definition maybe spoiled by the rotation of the sun. It is necessary that hoods of black cloth be used to keepout stray light, both at the slit and at the camera box,…
Spectrum analysis
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