Workshop Receipts, for the Use of Manufacturers, Mechanics, and Scientific Amateurs

Workshop Receipts, for the Use of Manufacturers, Mechanics, and Scientific Amateurs

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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. 1879 edition. Excerpt: ...whole of the electricity rushes to that point, and, being too abundant for the small iron wire, it heats and burns it out rapidly. The work is thus instantaneously stopped for this mould, and continues for the others; and the broken wire shows where the defect is. The iron wire should be very short, so as to burn rapidly. In closed moulds and with an insoluble platinum anode, the solution of sulphate of copper will be rapidly transformed into sulphuric acid and water. Therefore make two holes at the lower part of the mould, through which and the opening at the head left for the passage of the electrode a free circulation of the liquor in the bath may take place. When the operation is completed, remove the gutta-percha mould, and the skeleton anode must be pulled out. Close the three holes in the statue, and file oil' the seams left at the junction of the different parts of the mould. Filling the Hollow Deposit tcith Brass Solder.--First cover the exterior with clay, plaster of Paris, or Spanish white mixed with charcoal dust, and dry in a stove-room. This coat is to prevent the copper deposit from losing its shape and being oxidized by the heat. The interior of the article is then to be filled with the softest brass solder, and powdered borax, which are melted by a gas or turpentine blowpipe. All the hollow parts are soon filled with the solder, which imparts to them as much firmness and durability as is to be found in cast articles. Removing the Mould.--With a metallic mould, after having removed the useless portions of the deposits, pass a card or a blade of ivory between the model and the deposit The operation is the same with moulds of plaster of Paris, porcelain, marble, glass, or wood; but it i s difficult to save a plaster mould...show more

Product details

  • Paperback | 306 pages
  • 189 x 246 x 16mm | 549g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236571789
  • 9781236571786