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The girl on the right is removing dried plates from the plaster of Paris moulds after the surveyor has carried them into the drying chamber for several hours. The girl on the left is sponging small imperfections from the surface and trimming the edges. Shenango Pottery Works, Newcastle, Pennsylvania

The girl on the right is removing dried plates from the plaster of Par...

Picryl description: Public domain photo of 3d object, pottery, ceramics, free to use, no copyright restrictions image.

Rejected for slight imperfections, these piston duds will be dumped back into the furnace of a huge Midwest aluminum factory for recasting. Aluminum Industries

Rejected for slight imperfections, these piston duds will be dumped ba...

Public domain photograph of 1930s America, free to use, no copyright restrictions image - Picryl description

Buffalo, New York. These huge machines cut and slice imperfections from steel castings, in this case, gun barrels. They are manned by a man and a woman helper in the processing department of Republic Steel

Buffalo, New York. These huge machines cut and slice imperfections fro...

Picryl description: Public domain photograph of a machine, industrial equipment, engine, generator, free to use, no copyright restrictions.

Aluminum casting. Duds, rejected for imperfections, are thrown back into the furnaces for recasting. Location: a large Midwest aluminum foundry now converted to production of war essentials. Destination of the finished aluminum products is kept secret. They'll probably end up as jeep or airplane engine parts. Aluminum Industries Inc., Cincinnati, Ohio

Aluminum casting. Duds, rejected for imperfections, are thrown back in...

Public domain photograph - United States during World War Two, free to use, no copyright restrictions image - Picryl description