Practical Exercises in Magnetism and Electricity; Being a Laboratory Course for Schools of Science

Practical Exercises in Magnetism and Electricity; Being a Laboratory Course for Schools of Science

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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. 1901 edition. Excerpt: ...of the battery are connected together for a short time by means of a thick wire, which is afterwards removed, and the previous observation is repeated, the divergence obtained is less than before. Why is this? 3. Connect three Leclanche cells in series, and obtain a measure of the potential difference at the terminals by noting the divergence produced in a condensing electroscope. Re verse one of the cells, and repeat the observation. Is the divergence the same as before? That is, with the zinc plate of one cell joined to the copper plate of the next, and so on (as shown in Fig. 65). CHAPTER XVI MAGNETIC EFFECTS or AN ELECTRIC CURRENT 82. Direction in which a Magnetic Needle is deted by an Electric Current Apparatus reqaz'rezt.--A voltaic cell. Commutator (see note 23, p. 224). Cotton-covered copper wire. Compassneedle. Clamp, and piece of cardboard. A commutator (or current reverser, Fig. 66) is required in this experiment. The poles of the battery are connected to the ends of the movable arms by means of binding screws, and the terminals of the outer circuit are connected to the free wires dipping into the mercury cups on one side of the commutator. When the arm is in a vertical position the circuit is broken, and no current flows along the wire. If the arm is swung to the left the current will traverse the outer circuit in the reverse direction to that which is traversed when the arm is swung to the right. (i.) Direction of Deflection depends upon direction of ClJ-n'6nt.--Connect up the cell and copper wire (AB) to the commutator as shown in Fig. 67. Clamp the cardboard horizontally, so as to serve as a support for the compass-needle. Stretch out a length of the wire AB so that it is horizontal and in the magnetic meridian, more

Product details

  • Paperback | 56 pages
  • 189 x 246 x 3mm | 118g
  • United States
  • English
  • black & white illustrations
  • 1236992636
  • 9781236992635