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 418
rfaces present,as when the readings are takenin a dark room. The proof that the lightvaries inversely with the square of the distance from the source isas follows: Consider two spherical surfaces, Fig. 83, illuminated by a sourceof light at the center. The same quantity of light falls on both… … Fig. S3. Proof Diagram of the Law of InverseSquares by Method of Concentric Spheres Q = Qi- Q :^i = 47ri^2 Q 4tRx Q Q
Electrical engineering
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