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To Drill Glass

Wet an ordinary will answer, but not so well; it will then bore drill with petroleum or benzine; turpentine 2362. French Glass Used for Light- Houses. The special composition of the common glass nearly as rapidly as steel. If .

The special composition of the common glass nearly as rapidly as steel. If crown glass used for the light apparatus for it is intended to bore through, the glass should light-houses was, until quite recently, kept a be first countersunk on each side with a drill off so as to form a very flat threein France, and some firms in Birmingham, sided pyramid. Flint and plate-glass are very which had the monopoly of this branch of difficult to bore. It has been recently ascertrade. From the researches of David M. tained that dilute sulphuric acid is much more ENAMELS. effective, with less wear of the tool, than oil are first made on stone or plate and then of turpentine. It is stated that at Berlin, glass castings for pump barrels etc., are drilled, planed and bored like iron ones, and in the same lathes and machines, by the aid of sulphuric acid. printed on unsized paper with an ink consisting principally of a solution of asphaltum in oil of turpentine made with the aid of heat, to which some substance is added which shows a more or less crystalline structure on cooling, 2367. To Cut Glass Round or Oval as stearic acid, spermaceti, naphthaline, par- Without a Diamond. Scratch the glass affine. This mixture is strained and rapidly around the shape you desire with the corner cooled with constant stirring; it is the only of a file or graver; then, having bent a piece of wire to the same shape, heat it red hot and lay it upon the scratch, sink the glass into cold water just deep enough for the water to come almost on a level with its upper surface. 2368. To Break Glass in any Required Way. Dip a piece of worsted thread in spirits of turpentine, wrap it round the glass in the direction required to be broken, and then set fire to the thread, or apply a red hot wire round the glass; if it does not immediately crack, throw cold water on it while the wire remains hot. By this means glass vessels that have been broken may often be fashioned and rendered useful for a variety of purposes.

2369. To Break a Glass Bottle or Jar Across its Circumference. Place the kind of coating which thoroughly resists the action of the corrosive acid. The printed pa-- per is laid flat with the blank side on water, to which from 10 to 25 per cent. of muriatic acid has been added, and as soon as the lines show signs of softening the negative printing is transferred to the glass by a slight pressure; when the paper is removed, the picture will adhere to the glass, and this is afterwards exposed to the fluoric vapors in leaden troughs. 2375. Το Etch or Write on Glass. A writer in Dingler's "Polytechnisches Journal" recommends a solution of fluoride of ammonium, which can be used with an ordinary quill, and on drying leaves a distinct line.