An elementary book on electricity and magnetism and their applications . - j^£E1mature is now very sel- ^ 1Q, J riG. 135. — Magnetic field in a Gramme ring. dom used, but it is worth studying carefully because the fundamental principles of itsaction can be understood from very simple diagrams; whereasmost armatures of the common or drum type, although basedon exactly the same principles, cannot be represented by simple diagrams. A rotating soft-iron ring or hollow cylinder is mounted between the poles S I3=S& ^==P| N of an electromagnet, as in figure 135. The ring servesto carry the flux acros
An elementary book on electricity and magnetism and their applications . - j^£E1mature is now very sel- ^ 1Q, J riG. 135. — Magnetic field in a Gramme ring. dom used, but it is worth studying carefully because the fundamental principles of itsaction can be understood from very simple diagrams; whereasmost armatures of the common or drum type, although basedon exactly the same principles, cannot be represented by simple diagrams. A rotating soft-iron ring or hollow cylinder is mounted between the poles S I3=S& ^==P| N of an electromagnet, as in figure 135. The ring servesto carry the flux across from one pole to the other. There are scarcely any lines Fig. 136. — Gramme ring rotating in a Qf force m tne gpace [ns[^emagnetic field. . the ring. A continuous coilof insulated copper wire is wound on the ring, threadingthrough the hole at every turn. When the ring rotates, as infigure 136, the wires on the outside are cutting lines of force,but those inside are not. Furthermore, according to theRight-hand Rule, the outside wires on the right-hand side. 204 ELECTRICITY AND MAGNETISM are moving in such a direction that the induced current tendsto flow toward us. The wires lying on the other side of the ring are moving so as to inducea current away from there were no outsideconnections, these twoopposing wouldjust balance, and no cur-rent would flow. This
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
