File:The World book - organized knowledge in story and picture (1918) (14762106674).jpg

Identifier: worldbookorganiz04oshe (find matches)
Title: The World book : organized knowledge in story and picture
Year: 1918 (1910s)
Authors: O'Shea, M. V. (Michael Vincent), 1866-1932 Foster, Ellsworth D Locke, George Herbert, 1870-1937
Subjects: Encyclopedias and dictionaries
Publisher: Chicago : Hanson-Roach-Fowler
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

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hroughout as it cools,and the molecules have time to arrange them-selves in a stable position. The glass thereforeis made tough. Plate Glass, which is the most expensiveform of window glass, is made by a specialprocess. The ingredients are melted in huge,open vessels, or tanks, some of which have acapacity of two and one-half tons. These ves-sels rest upon frames behind fire-clay doors.When the melting has reached the requiredcondition the tank is drawn out by a greatfork mounted on a truck, and is rolled to thecasting table. There it is hoisted by a crane,and the contents are poured over the metalbed. The molten glass is spread out uniformlyby means of a heavy roller, and is then placedin the annealing chamber, where it remainsfor several days. It comes out in the formof rough plate, and must be polished beforeit is ready for service. Polishing is done bymeans of grinding machines which rub thesurface with sand, emery and rouge, first onone side and then on the other. In this process
Text Appearing After Image:
GLASS 2509 GLASS about forty per cent of the thickness is elim-inated, the resulting sheet being from one-fourth to three-eighths of an inch thick. To make wired plate glass a wire nettingis placed between the surfaces of the sheetwhile the glass is soft; the result is a strong,almost unbreakable pane, extensively used asa fire protection around elevator shafts andwhere there is danger from too close crowdingof buildings. Basement and other windowsthat are liable to be broken easily are alsofrequently made of it. Glass Tableware. A large part of the or-dinary glassware that appears on the table ismade by pressing. The press consists of aniron mold, containing the design and orna-mentation of the article to be made, and aplunger which is worked by a lever. Thegatherer places an iron rod into the moltenglass, bringing out a quantity of the substanceon the end of it. From this lump enoughglass is cut to make the article, and the massis dropped into the mold and pressed intoshape by the p

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