Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 145
l metal box cut into four equal sectorsby two diametial sections at right angles to each other. Eachquadrant is supported by an insuLiting glass stem, and the alternatepairs of quadrants, aa and Bii, are in conducting connnunicationwith each other. Each pair is connected nlso with a small insulated… … Fig. r.n. needle, which has the shape represented in the figure, and consistsessentially of two quadrants of thin sheet aluminium joined at thecentre, parts being cut out, as shown inthe figure, for still greater lightness. The needle usually hangs by twococoon fibres, which constitute what…
Electricity · Magnetism
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