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Modern Engineering Practice Volume 8

Modern Engineering Practice Volume 8


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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. 1903 Excerpt: ... the piece B. A strong magnetic field is consequently produced, the path of the magnetic flux being indicated by the dotted lines. The motion of the disk A in the magnetic field causes the production of eddy currents in it, which act to oppose the rotation and to bring the car to rest. The faster the car is moving, the stronger will be the current generated by the motors, the greater will be the electromagnetic eddy current action, and consequently the higher the brake action on the wheels. The brake is under the control of the motor-man, the current generated by the motors passing through the controller, to be later described, and applied to the brake either gradually or suddenly as desired. Another method of control is by means of an automatic switch which is placed in circuit in such a manner that the current strength from the motors is limited to that which will apply the maximum braking power, without making the car skid along the track. The main advantages of an electromagnetic brake are the swiftness with which it can be applied and the fact that it does not depend upon the current taken from the trolley wire. When the rails are slippery with mud or frost, the brake shoe sticks to the wheel and causes the wheel to skid or slip along the track. The result of this slipping is to wear the face of the wheel flat at one point of its periphery. Once a depression is formed there is considerable tendency to increase the amount of flattening, which makes the wheel very hard to brake and also produces a very disagreeable jolting motion. In order to prevent this skidding as much as possible, sand is poured upon the track. This increases the adhesion between the wheels and track, to a greater extent than that between the brake shoe and wheel and thus prevents th...


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Product Details
  • ISBN-13: 9781130588156
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 106
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130588157
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 204 gr


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