The Design & Construction of Induction Coils

The Design & Construction of Induction Coils

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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. 1908 edition. Excerpt: ...inch in diameter, is drilled % inch from the first. The large hole is placed over the rotating rod that projects through the hard-rubber block, while the small hole engages the pin. The plate and the brass contact semicircle are then secured in position by two nuts screwed to the rod. To the free end of the angle plate is soldered a flexible conductor, say 8 inches in length. The hard-rubber block is then screwed to the top of the condenser box with %-inch wood screws, the holes having been countersunk so that the heads of the screws will be flush with the surface of the block. The pins carried by the hard-fiber plate are inserted through the semicircular rows of holes in the hard-rubber base, the plate being small enough so that it will set in the aperture cut in the top of the box; the shoulders on the pins prevent them from projecting entirely through, since the larger holes in the base are drilled to a depth of % inch, while the ends of the pins are free to pass through the smaller holes that go entirely through. The spiral springs rest therefore between the shoulders of the springs on the one side and the hard-fiber plate on the other, and in this way it keeps the ends of the pins projecting beyond the face of the hardrubber block A inch when the switch is open. The fiber plate is attached to the bottom of the rubber block by four machine screws, % inch in diameter and % inch long. When the semicircular brass contact plate is turned by means of the handle, its edge, which strikes the contact pins, being beveled, forces them down % of an inch against the action of the springs, the latter serving to force the pins upward with considerable pressure, making good contacts with the rotating contact plate. The condensers are mounted in...show more

Product details

  • Paperback | 58 pages
  • 189 x 246 x 3mm | 122g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236848349
  • 9781236848345