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Wednesday
January 22, 2025
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History - Industry - PPG Tarentum
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Revolving Iron Disks
Grinding Surface of Plate Glass
Here we see a plate of glass after it has been thoroughly set and is nearly ready for sale.
The machines now used for the grinding save a great deal of time. The improvement is
chiefly in the March transfer polishing table, which combines the advantages of reducing
the temperature of the glass while grinding, by circulating water below it, thus
permitting a much higher speed in the grinders, with a device for polishing the under
side of the plate, without the frequently disastrous operation of removing it from its
plaster bed and turning it over. This transfer table is also movable from grinder to
polisher, effecting in this way a considerable saving of time, while ensuring the
greatest security in handling.
There used to be many restrictions upon the output of the glass-workers by the
Glass-Workers' Union but immigrants, willing to work on an unlimited plan, forced
themselves into the trade, and this compelled the Union, for self-protection, to
remove the restrictions on its members. The increased production because of the
removal of the union limitations amounted, in one case, to 100 per cent, and the
increase of earnings to about fifteen per cent. A discriminating entrance fee,
so effective in other instances, is employed by the flint-glass workers to protect
themselves against an influx of cheap foreign workmen.
Next - Workmen Finishing
Plate Glass Windows
Previous - Casting and Rolling
Sheets of Plate Glass
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