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Experimental Electricity Course in Twenty Lessons

Experimental Electricity Course in Twenty Lessons


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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. 1918 Excerpt: ... type, i.e., normally there is no current passing through the circuit. The closed circuit system of alarm is one of the best and most widely used. It has one great merit: that is, if a wire is cut, the bell will start ringing, and as most of the would-be second story electrical experts cut the wires at the start, it is seen that this system is indeed quite meritorious. The main difference in the closed circuit form of alarm, is that the battery is of the gravity or other closed circuit type, such as the Gordon Primary Cell. The spring contacts at the windows and doors, are normally closed instead of open, and the relay keeps the armature pulled toward the magnets at all times. When a window spring is open-circuited by raising the window, the circuit is broken, and the relay releases its armature, which falls back against the contact screw shown, closing the bell circuit. The bell used here, may be a common or continuous ringing pattern, already described. Some elaborate burglar alarm systems have a combination of the closed and open circuit, enabling the alarm bell to ring, if the circuit is opened or closed at a doon or window, or if the wires are broken or crossed at any point. Electrical alarms are often applied to clocks, for signalling the starting and stopping time in factories, arousing purposes, etc. A simple method of ringing a bell, or a number of them, from a large clock is illustrated by fig. 19. As many insulated brass screws are fastened around the dial, as times it is required to ring the bell, in the fashion indicated. They are adjusted, so that the hour hand makes contact with them at the desired time. The bell circuit is closed through the hands of the clock and the contact screw. A simple and effective method of making an electrical alarm...


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Product Details
  • ISBN-13: 9781231913543
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 62
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1231913541
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 127 gr


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