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 409
mentson optical effects; K^and K., are accuratelyfitting iron cylindersby which the borings,L, can be pluggedwhen not required.The magnetising coilsare wound in twelvesections, each of 20°,marked 1, 2, ... inthe figure. Each sec-tion of the coil has200 turns of wire, and,when all are in place,they… … Fig. 244.
Electricity · Magnetism
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-387-169.webp)
