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Electrical Measurement and the Galvanometer; Its Construction and Uses

Electrical Measurement and the Galvanometer; Its Construction and Uses


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: device by which the movements of the needle are ordinarily limited to variations of a very few degrees; this arrangement, by means of a projecting handle, can be turned round the case so as to be useful, irrespective of the extent of deflection. Figure 18 is a perspective view, and Figure 19 a plan view of the galvanometer. In the latter, A is Figure 18. the rubber base; B, B, B, the leveling screws; 1, 2, 3 and 4 the terminal binding screws, C the coils; N, the needle pointer; L the damping lever, and G the handle of the needle-guide or limiter. When it is desired to use the entire coil of 100 ohms, that is the 70 and 3oohm coils coupled in series, one of the connecting wires must be placed in No. I binding screw, and the other in No. 4. When the 3o-ohm coil is to be used alone, the wires are placed in 1 and 3. Figure 19. For very strong currents, and very low resistances we use the band coil, and in that case connect the wires in 1 and 2. The 7o-ohm coil may be used alone by connecting the wires with terminals 3 and 2. This instrument is sufficiently sensitive for any ordinary measurements, and with one cell of Le- clanche battery, gives, through a resistance of 12,000 ohms, using the 1oo-ohm galvanometer resistance, a deflection of 12 degrees; the 7o-ohm coil, under similar conditions, giving a deflection of 7, and the thirty-ohm coil a deflection of 6 degrees. With no external resistance, a deflection may also be produced with a battery consisting of a steel sewing needle, and a piece of brass immersed in a cup of water. THE RESISTANCE BOX, OR RHEOSTAT, Consists of a stout, but handsomely-made box of metal, having a mahogany base, and a hard rubber cover, on which, in addition to the plugs for controlling the resistances, there are six binding ...


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Product Details
  • ISBN-13: 9780217712002
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217712002
  • Publisher Date: 11 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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