Practical Information for Telephonists
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Practical Information for Telephonists

Practical Information for Telephonists


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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. 1882 Excerpt: ...this cell has no porous cup and no depolarizer, but consists simply of two opposing plates immersed together in a solution of sal ammoniac. This is now well known by the name of the "Law Battery," because introduced and manufactured by the Law Telegraph Company of New York. It possesses several well-defined advantages, chief among which, as previously indicated, is its simplicity of construction. Its extreme cheapness is also noteworthy, since it only costs $1.25 per cell complete, subject to discounts in quantities, and somewhere about ten cents per cell per annum for maintenance. The cover is tightly attached, so that evaporation or creeping of the saline solutions cannot ensue, and yet the cover can be easily put on and off at pleasure, as the sealing is effected by a rubber ring placed around the neck of the jar, over which the cover fits tightly. It is claimed by the introducers that the connections have never been known to corrode, and, as they are exposed to view, it is a very easy matter to determine the question. In the opinion of the author the chief fault of this battery is a lack of constancy. It is very evident that this battery is precisely the same as the Leclanche, minus the depolarizer; and necessarily shares in its faults while, owing to this very lack of a depolarizer, it is not, nor indeed can it be, so prompt in the revival of its strength when resting. Some enterprising persons and electricians, acting upon the suggestion of J. T. Sprague, the English electrician, have endeavored to prove the Leclanche patent invalid, but there is no sufficient ground for such an assumption. The Leclanche battery, claiming the use of peroxide of manganese when moistened by a liquid containing a salt in solution which has no chemical action up...


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Product Details
  • ISBN-13: 9781150857621
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 48
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1150857625
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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