Elementary treatise on electricity and magnetism (1903)
Foster, George Carey, 1835-1919, Joubert, Jules François, 1834-1910. Traité élémentaire d'électricité, Porter, Alfred William, 1863- joint author · London, New York, Longmans, Green, and co. · leaf 139
iical metal box cut into four equal sectorsby two diametral sections at right angles to each other. Eachquadrant is supported by an insulating glass stem, and the alternatepairs of quadrants, aa and bb, are in conducting communicationwith each other. Each pair is connected also witha small… … Fig. 65. 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 iscalled…
Electricity · Magnetism
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