Building Stone, Lathing, Plastering, and Tiling, Common Brickwork, Ornamental Brickwork and Terra Cotta, Lighting Fixtures, Use and Design of Lighting Fixtures, Architectural Design baixar o livro de graça

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...It is then run through a roller located at the end of the steel slab, which gives it the proper thickness and at the same time imparts a smooth or rough back to the glass, as desired. The plate, or panel, of glass is then placed on another steel slab, where it is allowed to cool, after which it is ready for shipment. The mixing of the natural colors to form the various kinds of art glass is a secret that is jealously guarded by manufacturers, and differs widely in the various concerns engaged in this work. 50. Shaping Art Glass.--Art glass highly ornamental in appearance comes in sheets or panels. When a certain shape and size is desired, the glass is cut to the required size and placed in a sheet-or cast-iron mold. A quick method of bending these sheets is as follows: The mold containing the glass having been placed in a sheet-metal box, a flame, composed of gas and air is played lightly on the glass until it becomes hot, when the intensity of the flame is increased by means of air pressure. The glass is then pressed on the metal mold with a steel tool resembling a poker, after which it is allowed to cool. Great care must be taken in removing the glass from the sheet-metal box, as a current of cold air or draft will cause the glass to crack. Double, or S, bends, while difficult to execute, are at times attempted in one piece, but owing to the danger of breakage, the general process employed is to make S bends in two pieces. These pieces are afterwards joined with ornamental bands, and do not detract from the general appearance of the finished article. 51. Color and Finish of Art Glass.--With the exception of ruby and opal, all colors of art glass bend readily. The former is one of the most difficult colors with which to effect a bend so as to retain the na...