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
Fig. S3. Proof Diagram of the Law of InverseSquares by Method of Concentric Spheres Q = Qi- Q :^i = 47ri^2 Q 4tRx Q Q … Fig. 84. Proof Diagram of the Law of InverseSquares by Method of Screen Shadow = 47ri?i2 : 4xi?2 qi R Fig. 84 shows the relation in another way. The area of C, dis-tant two units from the source of light A, is four times that of B,which is distant one unit. Lumnier=Brodhun Photometer. In addition…
Electrical engineering
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