The Yale Sheffield Monthly Volume 1

The Yale Sheffield Monthly Volume 1

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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. 1894 edition. Excerpt: ...My = 0.'. C' =Hl tan 6 is called constant of the gal21: vanometer. This instrument is called the " Tangent" Galvanometer because the current is proportional to the tangent of the angle of deflection. 0orrection for Many 'FVz'ndings. 25. One method of increasing the sensitiveness of a galvanometer is to increase the number of turns of the coil. If _this is done, due correction should be made in the formula. The following is the method for obtaining this correction. In Fig. 15 we have the section of a coil whose breadth is zb and thickness a. Now if n = number of turns, r = distance of any element of the coil from axis of X, p = distance of element of coil from origin, /.4 = strength of magnetic pole placed at origin, and C' = strength of current, from 24 C' = strength of current through element = C ( n hair) 2 l Expanding (1 + by binomial theorem and dropping 7' Suppose Needle Displaced along Axis by Distance z. 26. Force __ to line joining pole Concerning Position and Length of Needle in Galvonometera. 27', What effect would increase of length of needle have? The moment would become greater for slight deflections of needle current has greater efiect, but as deflection increases effect of current is less on long needle than on short. Suppose we put the needle at AB. If it turns, one pole passes into stronger G9 field and one into weaker field. Now L2 there must be a place where these changes balance each other. This Q r from plane of coil, where r is radius of B coil. This would be a good galvanom-eter but for the impossibility of finding magnetic center of a magnet. The Gauguin-Ilelmholtz galvanometer puts two coils of equal radius at equal dis-F'.--'1tances from needle and...
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Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • United States
  • English
  • black & white illustrations
  • 1236903501
  • 9781236903501