Malvern Save The Children Christmas Quiz
Quizzes & Puzzles2 mins ago
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(from http://www.1911encyclopedia.org/G/GL/GLASS.htm )
(B) Tube.The process of making tube has already been scribed. Although the bore of the thermometer-tube is :eedingly small, it is made in the same way as ordinary ~e. The white line of enamel, which is seen in some thermoters behind the bore, is introduced before the mass of glass Dulled out. A flattened cake of viscous glass-enamel is welded to one side of the mass of glass after it has been hollowed by wing. The mass, with the enamel attached, is dipped into I crucible and covered with a layer of transparent glass; I whole mass is then pulled out into tube. If the section of I finished tube is to be a triangle, with the enamel and bore the base, the molten mass is pressed into a V-shaped mould fore it is pulled out.