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Conversion. Copper and brass processing. Copper tube is made either by extrusion or piercing. In the piercing method, illustrated here, a hot round billet, or solid piece of copper, about fourty-five inches long, is rotated between tapered rolls and forced against a pointed mandrel which pierces the center of the billet. The billet then emerges in the form of a tube about eleven feet long. The Chase Copper and Brass Company, Euclid, Ohio

Conversion. Copper and brass processing. Copper tube is made either by...

Picryl description: Public domain image of an industrial building, factory, workshop, workers, 19th-20th century, free to use, no copyright restrictions.

Subcontracting. Passaic home workshop pool. A worker in the Passaic, New Jersey shop of the Howe Machinery Company files a flange used in an expanding mandrel for v-belt drives. In addition to the work in its own shop, the concern is also farming out considerable work through a home workshop pool it organizes

Subcontracting. Passaic home workshop pool. A worker in the Passaic, N...

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

Workman removing cotton seed cake from mat after oil has been removed. The cake is removed by means of a mandrel machine. Cotton seed oil mill, McLennan County, Texas. The movement of this machine was so fast that it was impossible to stop the action with fastest shutter speed of the camera

Workman removing cotton seed cake from mat after oil has been removed....

Picryl description: Public domain image of a factory worker, plant, manufacture, assembly line, industrial facility, early 20th-century industrial architecture, free to use, no copyright restrictions. show less

Stripping tube on mandrel before sending to cure, Goodyear Tire Factory, Akron, O.

Stripping tube on mandrel before sending to cure, Goodyear Tire Factor...

J298245 U.S. Copyright Office. No. 22337. Public domain photograph of industrial revolution, stereoscopic card, free to use, no copyright restrictions image - Picryl description