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Electric Disc and Experiments, by a Positive Conductor

Electric Disc and Experiments, by a Positive Conductor


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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. 1869 edition. Excerpt: ...a boat with two boatmen is fixed upon a piece of glass. coloured on the under side to imitate water. The figures have an axis at the seat, in about the centre of their gravity. They hold a pair of oars which are balanced on the sides of the boat. Two small knobs in the bottom of the boat, one connected with the machine, and the other with the earth, alternately attract and repel the lower portion of the figures, giving them a rocking motion, also working the oars. Experiment 64.--The electric bell. This experiment illustrates the power of attraction and repulsion as in experiment 58; but instead of a light substance (the pith ball) we have a metal ball insulated by hanging it on a thread of silk. A small bell is also insulated in a similar manner, and both are hung at a short distance apart, upon a small metal crane, which also requires to be insulated from the ground by a glass stand. A chain from the centre of the bell is conveyed to some object in connection with the ground, and the chain from the machine is connected with the metal crane on which the bell and ball are suspended. When the machine is worked the side of the crane attracts and repels the ball, and causes it to strike the bell rapidly. The ball and bell sometimes require a little adjustment for striking distance. When the ball is in motion it is necessary to work the machine very slowly, or the electricity will pass in sparks, instead of by striking contact. Experiment 65.--A variation of the above experiment is made by fixing a second bell on the stem of the crane, or by fixing one bell on a centre stem, and three or four other bells, each with suspended balls, surrounding it. The effect of either of these plans is of course increase of sound. The equivalent arrangement...


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Product Details
  • ISBN-13: 9781234374082
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234374080
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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