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Electrical Railroading

Electrical Railroading


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ... standing at the commutator end. The N-pole side moving upwards has its E.M.F. in direction from back to front of armature through the inductors; the S-pole side has E.M.F. in direction from back to front of armature through the dead "Wire. In winding the armature the wire is laid on in a continuous spiral as shown. This makes the E.M.F. in each half of the armature in series, and allows the current to flow from one coil to another, except at the points where the N-half and S-half of the armature meet. Here the E.M.F.'s oppose and if wires were connected for an instant to the winding, as shown in the picture, the two opposing E.M.F.'s would both force electricity out into the wire at the top of the armature and draw it in at the bottom as shown by the arrows on these wires. This will cause a current to flow in the external circuit. Fig. 192. Eight Coil Gramme Ring Winding, with Eight Part If the junctions of the coils are connected to eight commutator bars (one bar per coil) and connect the ends of the external circuit by brushes to the commutator bars which are midway between the N-and S-poles, then each half of the armature separately generates an E.M.F. and delivers current to the external circuit. Suppose the armature to be revolving at the highest safe speed. Each inductor will move past the magnet poles at a speed of 3000 ft. a minute. With pole pieces 5x8 inches and a flux density of 90,000 lines per square inch, the total flux will be 5 x 8 x 90,000 or 3.6 million lines. Commutator. The armature may be 9 inches in diameter, which gives its rotative speed 1270 (nearly). For R.P.M.=P.S.t-H3.1416 X diameter). 3000 X 12 = 3.14i6 X 9 ==1270 nearly, which R.P.S4=21 nearly. An inductor therefore cuts 3.6 million lines of magnetism twenty-one times a s...


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Product Details
  • ISBN-13: 9781130686937
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 142
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1130686930
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 268 gr


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