Laurence, Lionel · London, School of Optics · leaf 36
n either side, and their intensities are compared byviewing the sides of the two slabs simultaneously. This is also known asthe Joly photometer. The Lummer-Brodhun Photometer.—This photometer is largely used inscientific laboratories, being accurate to about 1%. Its superiority overthe Bunsen and… … Fig. 21. The instrument (Fig. 21) consists of a rail on which the two luminantsLv and L2 can be made to travel at right angles to the opaque screen A B,which is whitened on both sides. From A B the light is reflected to thetwo mirrors My and M2 and thence through the cube of glass C D made oftwo…
Optics
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