The Methods of Glass Blowing; And of Working Silica in the Oxy-Gas Flame

The Methods of Glass Blowing; And of Working Silica in the Oxy-Gas Flame

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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. 1902 edition. Excerpt: ...inner tube, a tube 12 mm., or rather more, in external diameter, and of rather thin glass, is drawn out, as for closing, until only a very narrow tube remains at C, the end of C is closed the area round 0 is carefully blown into shape, so that by melting off C the tube A will be left with a well-rounded end. A small bulb of glass is next blown on A at B. This bulb must be of slightly greater diameter than the contracted end E of the larger tube (II.), so that B will just fail to pass through E. The length from B to G must not be made greater than from E to G on the outside tube. The end at C is then to be cut off so as to leave a pin-hole in the end of A. The outer tube (II.), whose diameter may be 5 or 6 mm. greater than that of A, is prepared by sealing a side tube on it at F, after previously contracting the end E. For this purpose the end E should be closed and rounded, and then reheated and blown out till the bulb bursts. To ensure that the diameter of the opening is less than that of the tube, care must be taken not to re-heat too large an area of the end before blowing it out. It is very important that the cross section at E shall be in a plane at right angles to the axis of the tube. Wrap a strip of writing paper, one inch in breadth, closely round the end of A at C till the tube and paper will only just pass easily into the mouth D of the outer tube, push the inner tube A, with the paper upon it, into D, and when the paper is entirely within D, withdraw A, and cautiously push the paper a little further into the outer tube. Insert A into BE through E, so that the bulb B is embraced by E. Close D with a cork. Ascertain that the paper does not fit sufficiently tightly between the two tubes to prevent the free passage of air, by blowing more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236538609
  • 9781236538604