Inspecting Plate Glass after Polishing, Rossford, Ohio.
After the plate glass has been rolled and properly cooled (annealed) it is taken to a cutting room where it can be shaped to a proper size.
The big plates are then moved to the polishing room. The polishing consists of three processes: grinding, smoothing and polishing. Grinding and smoothing are done almost in the same way. Rotating tables, wheels of iron such as you see are let down on the surface of the glass. Emery, fine sand, or carborundum is sprinkled on the surface. The tables of iron are let down until they fit closely against the surface of the glass and then are set in motion. The fine particles of emery, etc., cut the surface of the glass very smooth.
The next process, that of smoothing, differs from the grinding only in the fineness of the sand or emery used.
The last process is that of polishing. Revolving plates are covered with leather or some other soft material. The rubbing that the surface of the glass gets gives it a fine luster. The plates are then ready for shipping.
The United States leads every country in the world in the manufacture of glassware. The 1910 census shows that during the previous year the value of our output was $92,000,000. Our chief glass manufacturing states are New Jersey, Pennsylvania, Ohio, Indiana, and Illinois. The industry came to center in these sections because of the excellent supply of fuel. Muncie, Indiana, and other cities in that district, used their natural gas to develop their glass factories. Pennsylvania makes over one-third of the glass we produce, and the Middle Western States make another third. Belgium has the greatest plate glass factories in the world.
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