Gramophones & Phonographs

Gramophones & Phonographs

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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. 1914 edition. Excerpt: ...The drying will take several days in a warm room, when it will be quite stiff and hard, and ready to receive the bell-mouth, which is prepared as follows. Procure an ordin at B 0 (Fig. 56), which can be purchased for about Is. Now mark out and cut a circle of cardboard the diameter of the paper cone, which should be 11% in. full, but owing to variations in rolling on the paper this will vary slightly. Lay the cardboard in the bowl and, with a pencil, mark round it on the side of the bowl. Tap lightly around this line with a hammer so as to chip the enamel. Repeat the hammer ing on the outside of the bowl, being careful not to dent the metal. A line should now be scratched on the inside of the bowl, again using the cardboard as a _' template, and then cut round Jr......... _.' with a small chisel or a hack-saw; the metal is easily cut, as it is very soft. The bottom part of the bowl is now discarded, and the rough edge of the upper part, which forms the bell mouth, smoothed with a half-round file. Mark a line ii in. from this edge, and with a pair of square-nosed pliers bend this %-in. piece slightly outwards, working round till a rim is formed (see Fig. 57), to fit the wide end of the born. When it fits on square, run a pencil line round the outside of the horn, inside the bell-mouth, which should be removed and the horn trimmed neatly to the line with a strong pair of sharp scissors. The bell-mouth can now be permanently fixed in position on the horn with glue or Seccotine, the latter for preference. Seccotine is also suitable for fixing the flexible connector D (Fig. 53), a portion of one or two layers of paper being removed with a sharp table knife, using a sawing action to avoid disturbing the inside layers of paper. more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • United States
  • English
  • black & white illustrations
  • 1236883713
  • 9781236883711