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The Cheap Magazine [ed. by G. Miller.] Vol
The Cheap Magazine Vol - ed. by G. Miller. Author:George Miller General Books publication date: 2009 Original publication date: 1814 Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million book... more »s for free. Excerpt: Evening Instructions ; OB, A Ather's Advice To His Son On The Choice or A Trade. THE GLASS-BLOWER. L LINT glass is formed of soda, pounded flints, and oxids i lead j it is the most transparent and beautiful glats, ind is often called crystal. Crown-glass contains no lead) tut is composed of soda and hue sand, and is used for tho ianes of windows. Bottle-glass is the coaistst of a41, ind is composed of kelp and common sand. Vhen the ingredients of which glass is composed ars perfectly fused, and have acquired the necessary degree of fiear, the workman dips the end of his blowing-pipe (a hollow tube) into the melting pot, and by turning it about a, niall quantity of the glass, or metal, as it is now called, aen s to it; this he repeats till a sufficient quantity is taken up, rolling it gently, betwixt each dip, upon a piece of iron, to unite it more intimately, and then blows through the tube, tiH the melted mass at the extremity swells into i bubble 5 after which he again rolls it on a smooth surface, and repeats the blowing, till the glass is brought as near the size and form of the vessel required as he thinks necessary. If a bottle is to he formed, the mass at the end of the tube is put into a mould of the exact size and shape of its bdy, and the neck is formed on the outside, by drawing oat the ductile glass. If it be a vessel with a wide orifice, the glass, in its melted state, is opened and widened with an iron tool; after which, being again heated, it is whirled about with a ciicular motion, till it is extended to the size required. If a handle, foot, or any thing else of the kind be requi...« less