Specification of James Childs : manufacture of artificial gums, teeth, &c.

  • Childs, James.
Date:
1859
Catalogue details

Licence: Public Domain Mark

Credit: Specification of James Childs : manufacture of artificial gums, teeth, &c. Source: Wellcome Collection.

    8/10 (page 6)
    Childs Improvements in the Manufacture of Artificial Gums, Teeth, $c. quantity of water into the vessel b, and allowing the surplus to blow off by the safety valve, I only place in the vessel exactly the quantity of water which is required ; thus, if the capacity of the vessel b is one cubic foot, and I desire a pressure of about 15 lbs. per square inch above atmospheric pressure, I place two cubic incheses of water in the vessel, and if I desire a pressure of 30 lbs., 5 I place three cubic inches of water in the vessel, and so on; the increase of pressure produced by the heat, after all the water is evaporated, is compa¬ ratively small. The pressure of steam in the vessel I prefer to keep at about ten to twenty pounds on the square inch, or a greater pressure may with advantage be employed if the articles to be converted are of large size, or a 10 very hard material be required: this, however, may be varied. The compositions of india-rubber or gutta percha and sulphur may be such as have heretofore been employed, and the degree of heat employed, and the duration of the process will be the same as when saturated steam at a high pressure is employed, as has been common ; the construction of the moulds, 15 when moulds are employed for containing the articles, will also be as heretofore. In witness whereof, I, the said James Childs, have hereunto set my hand and seal, this Twenty-first day of July, in the year of our Lord One thousand eight hundred and fifty-nine. 20 JAS. CHILDS, (l.s.) LONDON: Printed by George Edward Eyre and William Spottiswoode, Printers to the Queen’s most Excellent Majesty. 1859.