Electric Bells; How to Make and Fit Them, Including Batteries, Indicators, Pushes, and Switches

Electric Bells; How to Make and Fit Them, Including Batteries, Indicators, Pushes, and Switches

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... the elements is reversed, the zinc rod being placed in the porous cell. In another (the Victoria Leclanche), the zinc element is used in the form of a plate in a rectangular cell. Neither of these has superseded entirely the original form of the Leclanche cell. A comparatively new departure from the old style Leclanche cell--named the Carporous, or central zinc Leclanche--has the agglomerate block for each cell in the form of a porous cell, in the centre of which the zinc element is suspended. The internal resistance is thereby reduced to ohm in the large sizes, and to 1 ohm in the smallest size. An agglomerate Leclanch6 battery is of simple construction and can be easily made. Fig. 77 shows two forms of the negative element, the chief feature being the absence of the porous pot. The mixture is nearly the same, but is made into blocks by using an adhesive medium, and by heat and pressure; one form is a solid block, and the other is two plates a a, Fig. 77, one on each side of the carbon. The result is that the internal resistance of the cells is somewhat reduced, as shown by the following table: --The zinc or positive element is held in its place by indiarubber rings, and is kept from touching the block by a strip of wood. In making for home use an ordinary Leclanchei cell, stone or glass quart jam jars with large mouths and free from cracks should be thoroughly cleaned and waxed, or painted with Brunswick black, as previously described. In place of a porous pot a bag may be used made from a square of good thick close canvas 8 in. by 7 in. Stitch together into the form of a round sack or bag (see Fig. 78) with a round flat bottom. Dip $ in. of the bottom several times into melted paraffin wax and dip 1 in. of the top into hot pitch and resin. It..show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236633970
  • 9781236633972