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To Engrave on Glass

To engrave on glass, fluoric acid is used, either in the liquid state or in vapor. This acid is kept bottle in a vessel of water, to the height where in metal bottles, and requires very careful it is designed to break it; also fill the bottle handling. The glass must be warmed, and to the same level. Now pour coal oil inside coated with wax, or engravers' cement, and and out on the water; cut a ring of paper, the writing or design traced through the wax fitting the bottle. Saturate with alcohol or with a pointed instrument. The liquid fluoric benzine, so that it touches the oil. Pour, acid is poured on it, and left to act on the unalso, some inside the bottle. Set on fire; the covered portions of the glass; or pour some cold water prevents the glass from heating of the acid in a small lead pan, which place below its surface, while the expansion caused in a still larger vessel filled with sand; heat by the heat will break the vessel on the water line. the sand and place the glass object over the gas liberated from the heated acid, and it will soon be found to be beautifully etched. Great care must be taken when this is going on, for the gas, as well as the acid, is of a very deleterious character. The same effect may be produced by the use of fluorspar, powdered and made into a paste with oil of vitriol, laid over the prepared surface, and covered with lead-foil or tea-lead; or bruised fluorspar is put in a wedgwood evaporating basin, with