Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 19
an using alonger pointer, and thus a larger apparatus ; the increase in weight ofthe pointer would require a stouter support, which again would meana loss of sensitiveness. What is wanted is a long weightless pointer,and fortunately this is exactly what we have in a beam of light. Asthe method of a… … l3o^. \ Fig. 7. form of electric glow lamp, and its position is near the principal focusof the lens L, which is meiely a condensing lens, to brin^ the lioht INVERSE SQUARE LAW 9 from the filament into a suitable direction. The magnetometer mirroris usually concave, having a radius of curvature of…
Electricity · Magnetism
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