The Electrical Review Volume . 2

The Electrical Review Volume . 2

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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. 1874 edition. Excerpt: ...columns at an early date. Practical Formula Relative to Telegraphic Batteries.--M. Emile Lacoine.--Eeserved for literal translation. Scientific American, Vol. xxx., No. 18, April 18, 1874..Yeir Electric Disengaging Gear for Knitting Machines.--A novel and ingenious application of electromagnetism to the knitting machine, the object beiDg to stop the loom instantly and automatically whenever a thread breaks, is injured, or is of abnormal thickness, or when a needle becomes bent. Through certain combinations, we learn that ono man can easily attend to four looms. The apparatus is in use in a largo factory near Montargis, in France. A Gramme electric machine is there substituted for the battery, and supplies a current sufficient for 150 looms. No. 19. April 25, 1S74. Improved Lightning Rod.--Electricity is best dissipated by conductors which present a large number of sharp edges; and if such angles extend throughout the length of the conductor, the current is received at any poiut as readily as at the pointed apex. It is on this principle that Mr. Miusen, of Indianapolis, has invented his improved form of lightning-rod. In addition to these advantages, it presents a variety of others, rendering it, it is claimed, a thoroughly efficient protection to any edifice upon which it may be placed. The rod is composed of copper wires and large galvanised iron wires, manufactured into a single rope. The copper wires are square in section, and are drawn perfectly straight, so that when thoy are twisted up in the rod an innumerable number of sharp edges is presented. The iron wire is galvanised not only to prevent corrosion but to increase its conducting power. The presence of two dissimilar metals in the rod also results in constant magnetic action, whereby...
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Product details

  • Paperback | 412 pages
  • 189 x 246 x 21mm | 730g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236559509
  • 9781236559500