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Electricity and Its Recent Applications; A Practical Treatise for Students and Amateurs with an Illustrated Dictionary of Electrical Terms and Phrases

Electricity and Its Recent Applications; A Practical Treatise for Students and Amateurs with an Illustrated Dictionary of Electrical Terms and Phrases


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III. DYNAMOS AND HOW TO ISUILD ONE. Dynamos, or generators, as they are termed, are machines for generating electricity by mechanical force. Practically any machine that generates electricity by mechanical means, from the large generators of to-day, back to the copper disc which was rotated between the poles of a magnet by Faraday, may be called a dynamo. We may say that a dynamo consists of three parts, namely: The field magnets, the armature and the commutator. The field magnets are usually the stationary part, and consist of iron cores, solidly connected together with an iron frame, and have a number of layers of insulated copper wire wound around them. These magnets are called electro-magnets, because they are practically only magnetic when a current of electricity is passing through their coils. There, however, remains a feeble residual magnetism in the pole pieces, which, when excitedby rotating the armature at a high rate of speed, within the magnetic field, will induce a small current in the coils, that rapidly increases, and on being transmitted through the coils of the electromagnets, augments their magnetism and produces in them still stronger currents. The armature, usually the rotating part, is an iron core, made up of soft iron discs. These discs are mounted on a shaft, and are insulated from one another by placing between them thin sheets of paper. Upon this core is wound a number of layers of insulated copper wire, and their free ends connected to the segments of the commutator. The commutator consists of a number of copper bars or segments, usually affixed radially around the shaft of the machine, each segment being thoroughly insulated by thin sheets of mica, each segment receiving the electricity that is generated from the coil or coils...



Product Details
  • ISBN-13: 9780217469258
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 50
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 0217469256
  • Publisher Date: 13 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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Electricity and Its Recent Applications; A Practical Treatise for Students and Amateurs with an Illustrated Dictionary of Electrical Terms and Phrases
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