THE CHE
NEW
The 750,000-square-foot annual rapacity mirror plant the Pittsburgh Plate Glass Co. in building at Ford City, Penna., will use the assembly line method of manufacture. Upper left corner. Plate glass is first cut to size of the finished mirror. Already marked with chalk, it moves on a conveyor to the cutter, Left center. Smaller pieces are edgepolished with an abrasive wheel. Left. The conveyor carries glass to an automatic scrubbing opera tion and under revolving brushes that apply tin chloride solution.
MICAL PARADE
These illustrations, although notofthe actual plant being built by Pittsburgh Plate Glass Co., are designed to show how it will appear when completed.
Above. Special silver salt solution is applied mechanically. When the precipitation is complete, excess solution is washed off. Upper right corner. Glass is raised vertically on a rack. The operator attaches electrodes and the rack slides into a bath for electroplating a protective copper coating over the silver. Right center. A swinging paint spray gives copper two coats of special paint. Right. About 20 to 25 inches of finished mirror come from conveyor per minute. A mirror is made in 90 minutes.
