Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 419
Lummer-Brodhun. The essentialfeature of this instrument is the optical train which serves to bringinto contrast the portions of the screen illuminated by the twosources of light. Referring to Fig. 85 the screen S is an opaquescreen which reflects the light falling upon it from L, to the mirrorM,… … Fig. 85. Diagram of Lummer-Brodhun Screen ar or h s will be reflected as shown by the arrows. We see thenthat the light from L, which falls on a r and b s, is reflected to theeyepiece or telescope T, while that falling on * r is transmitted toand absorbed by the black interior of the containing…
Electrical engineering
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