Motor Cycles; A Practical Handbook on Their Building, Care and Management. with Special Chapters on Ignition

Motor Cycles; A Practical Handbook on Their Building, Care and Management. with Special Chapters on Ignition

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ... without touching it. The great majority of the magnetic lines pass from one pole direct across to the other, leaving the North and entering the South pole as indicated by the direction arrow in Fig. 53. A certain number of lines escape outside the pole-pieces, however, especially when, as in this figure, the armature is not in position; and as all such "leakage " lines are useless the object is to concentrate them within the tunnel produced by the pole-pieces as far as possible. Unfortunately, magnetism cannot be insulated, and nothing we can do will stop them from leaking away in a direction where they cannot be utilised by interposing-substances such as paper, silk, fibre, rubber, etc., which effectually insulate or restrict the movements of an electric current. They have, therefore, to be " entic'ed.'"'as it were, into the direction they are wanted by offeringithem the allurement of an easier path t3ha"n ft 1cents; Zone'-e?ni;oun te;re d this is to provide an iron circuit for themtto. travel through, just as we should provide a copper circuit t7"rei1der-, a'fiow of current as easy as'possible. Iron has the property of Figs. 55 and 56.--Changes in flux distribution as armature rotates. concentrating, collecting, and focusing all magnetic lines in its neighbourhood, and bending them round until their path lies almost. entirely in the new direction outlined by the iron boundary. A magnetic field, therefore, is flexible, and follows the line of least resistance. Turn now to Fig. 54 and notice" how the introduction of the iron shuttle-shaped armature of a magneto between the pole-pieces totally alters the distribution of the lines as in Fig. 53. Their passage from thshow more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236800567
  • 9781236800565