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Weston Electrical Instruments for Use on Alternating-Current Switchboards; Catalog 16

Weston Electrical Instruments for Use on Alternating-Current Switchboards; Catalog 16


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About the Book

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. 1911 edition. Excerpt: ...type, a patent on which was applied for in December, 1897. The Weston portable wattmeter is well known; it has been of inestimable value in the development of alternating-current engineering practice and is universally recognized as the best wattmeter on the market to-dav. O J The Weston horizontal edgewise switchboard wattmeter is described in Section 2 of this catalog. The horizontal edgewise arrangement was adopted to avoid friction at the pivots, which is a serious obstacle to the production of a Horizontal thoroughly useful electrodynamometer wattmeter. Although by use Wattmeters of expecnent in conjunction with an effective oil damper, an accurate, reliable and durable instrument was produced, it was never officially placed on the market. The reason for this action on the part of the Weston Electrical Instrument Company, was its unwillingness to accept the horizontal edgewise type as the final solution of the switchboard wattmeter problem. However, the Company has made and sold a large number of these horizontal edgewise wattmeters and voltmeters, and many are now in use. The horizontal edgewise instrument saves a slight amount of vertical space on the switchboard; however, this saving in space is more than offset by decreased accuracy and by difficulty of reading. A horizontal edgewise scale can be read only from a position directly in front of the pointer. In fact, if the pointer is near that end of the scale farthest from the observer it is often entirelv invisible. Furthermore, the curved glass cover has the disagreeable characteristic of reflecting strong light? in such a manner that considerable manoeuvring is often necessary in order to see the scale and sometimes even the pointer. In most cases the reason for limiting the...


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Product Details
  • ISBN-13: 9781234368753
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234368757
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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Weston Electrical Instruments for Use on Alternating-Current Switchboards; Catalog 16
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