The Glass Sands of Kentucky: A Detailed Report Covering the Examination ... by Charles Henry Richardson

Author:Charles Henry Richardson
Language: eng
Format: epub
Publisher: The Kentucky Geological survey
Published: 1920-03-25T05:00:00+00:00

other than window glass lead, which imparts to It la the choicest ma-

terial for table ware, cut gla£fs ware, optical Kla-ss, and the highest grade of blown and pressed ware that adorns the home. Covered glass pot furnaces must ibe used in fusing the batch.

Formerly all lead flint glass was made by hand, but now both blowing and pressing machines are widely used.

In the process as watched in one factory, a hollow metal rod is. inserted into the batch of glass, which is in a state of perfect fusion. Th9 cold metal serves as a bait. Enough glass is gathered for a single tumbler. This is rolled back and forth in the air to give it uniform consistentcy. The material is then worked over a metallic iron slab or marver. The glass is then distended a little by the breath and placed in a mold that elongates the glass. It is then placed in a mold that is the exact form of the tumbler desired. The glass is removed from the gathering rod by touching the neck with a cold metal and adding water to effect the fracture desired. The tumbler is now placoJ by tongs in a tray kept warm by gas. When the tray is filled the tumblers are placed in a cooling oven, where the cooling is gradual to prevent fracture. After the tumblers are removed from the cooling oven they are marked by a carborundum wheel at the altitude the tumblers are to be cut. Each tumbler is then placed in a metal form where between two metals a narrow gas flame cuts off the top of the tumbler. The rim of the tumbler is then ground on an emery wheel to an even tho sharp surface, and then flre glazed on the rim. The tumblers are now ready for sorting, packing and shipping.

CUT GLASS.

Cut glass is first blown into the form desired from the brilliant water white crystal metal. It is then ground into a cluster of glistening facets. Grindstones continuously moistened with a stream of wet sand cut the rough pattern and finally putty powder is used to finish the brilliant angles.

PRESSED GLASS.

Pressed glass is the least expensive kind of lead fiint glass. The pressing machine contains a mold of the object to be made. One workman gathers the molten glass, cuts it off, and drops it into the mold of the pressing machine. Another workman pulls a lever which throws down a plunger and the glass is pressed into the exact form of the mold.

Some practical differences between American and Bohemian cut glass are: (1) In the American product the facets are cast instead of cut. (2) The angles are rounded instead of sharp. (3) The luster is less brilliant.

Glass Sands—3

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