. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . he same it is explained that N stands fornorth-seeking, S for south-seeking; and there is further stated thelaw that like poles repel, while unlike poles attract, each other,Kevertincr now to what was said of the passing of a current rounda core, let us, for the sake of brevity, call the directions just men- 305 76 THE ELECTRIC TELEGRAPH tioned anti-clockwise and clockwise. At the end of the core, atwhich one is
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . he same it is explained that N stands fornorth-seeking, S for south-seeking; and there is further stated thelaw that like poles repel, while unlike poles attract, each other,Kevertincr now to what was said of the passing of a current rounda core, let us, for the sake of brevity, call the directions just men- 305 76 THE ELECTRIC TELEGRAPH tioned anti-clockwise and clockwise. At the end of the core, atwhich one is looking end on, magnetic poles are formed accord-ing to this law: AVhen the current passes anti-clockwise Npolarity is induced in the near end, S polarity in the far end; whenthe current passes clockwise, S polarity is induced in the near end,N polarity in the far end. In the instance shown in Fig. 25 inthe line C Z, there will be formed at A and D, X and S polesrespectively; at B and E, S and N poles respectively. There istherefore on one side of the space between the cores an N mag-netic pole; on the other side an S pole; it remains to providesomething on which they may Fig. 25. In Fig. 20 let S be the end of a permanent magnet semicir-cular in shape; a strip of soft iron for an armature is so pivotedthat it can move freelv between the stops at the upper end. Inthe armature the induced poles are marked with the small letters11 and ,S, in accordance with the principle stated in Elements ofElectricity. With no current in the wire CZ, a current in theMire in the direction C to Z will induce, according to the clockrule, at A, N magnetism; at B, S magnetism. The K pole, ac-cording to a law already stated, attracts the s pole of the armature;the S pole repels it; the armature is strongly moved towards frontstop F. The current ceases, let us suppose; but the armature hasno spring, and its position remains unchanged until a current flowsthrouch the same wire in a direction from
Size: 2140px × 1167px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidcyclopediaofappl00ameruof
