Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 140
al 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 with a small insulated… … ^^^^ ■p^r needle, which lias the shape represented in the figuie, and consistsessentially of two quadrants of thin sheet aluminium joined at thecentre, paits being cut out, as shown inthe figure, for still greater lightness. The needle usuall} hangs by twococoon fibi-es, which constitute what…
Electricity · Magnetism
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