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Production. 155mm shells. A government inspector checks 155mm shells after the finish turning of straight and profile diameters in a large converted auto plant. Willy's, Toledo, Ohio

Public domain photograph of the United States military and military-industrial complex before World War Two, 1930s, free to use, no copyright restrictions image - Picryl description

Production. 155mm shells. Inspection after the finish turning of straight and profile diameters of 155mm shells in a converted auto plant. Willy's, Toledo, Ohio

Public domain photograph - working class people, the 1930s United States, work, labor, worker, free to use, no copyright restrictions image - Picryl description

A Detroit manufacturer of air craft engines is seeking automatic screw machine facilities for the manufacture of ninety-six items of steel and bronze air craft engine hardware in quantities from fourteen thousand to two-hundred thousand and in diameters from one-quarter inch to one and one-half inches. Three of the items are illustrated. Left, oil relief valve cap; right, cap nut

Picryl description: Public domain image of an aircraft, assembly line, industrial facility, 1930s aviation, free to use, no copyright restrictions.

A Detroit manufacturer of aircraft engines is seeking automatic screw machine facilities for the manufacture of ninety-six items of steel and bronze aircraft engine hardware in quantities from fourteen thousand to two-hundred thousand and in diameters from one-quarter to one and one-half inches. Three of the items are illustrated. Top left, bolt; top right, retainer; bottom, cylinder head stud

Public domain photograph of indoor, interior activity, America in the 1930s, free to use, no copyright restrictions image - Picryl description

Conversion. Copper and brass processing. Pickling lengths of copper water tube in a brass and copper mill. After annealing, or softening by heat to reduce brittleness and allow further drawing, tubes are "pickled" in a sulphuric acid solution to remove oxide and scale that result from the anneal. Bundles of the tubes are picked up by electric cranes and transported from the pickle to a rinse bath of water. The tubes are then returned to the drawbench for re-drawing down to smaller diameters. Chase Copper and Brass Company, Euclid, Ohio

Public domain photograph - historical image of Ohio, United States, free to use, no copyright restrictions image - Picryl description

Detroit, Michigan. Steps in the manufacture of casings for 105 mm. shells in the Budd wheel plant. Process inspection of a shell: testing interior diameters and threads

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

Train of heat-exchangers, condensers, reboilers, superheaters ; Isobutane-column, 50 trays ; Hydrochloric-acid stripper ; Reactor-chillers, 50-inch and 66-inch diameters.

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Diameters

Production. 155mm shells. A government inspector checks 155mm shells after the finish turning of straight and profile diameters in a large converted auto plant. Willy's, Toledo, Ohio

Production. 155mm shells. Inspection after the finish turning of straight and profile diameters of 155mm shells in a converted auto plant. Willy's, Toledo, Ohio

Detroit, Michigan. Steps in the manufacture of casings for 105 mm. shells in the Budd wheel plant. Process inspection of a shell: testing interior diameters and threads

4 JOURNAL BEARINGS SHOWING DAMAGED INNER DIAMETERS ID

4 JOURNAL BEARINGS SHOWING DAMAGED INNER DIAMETERS ID

4 JOURNAL BEARINGS SHOWING DAMAGED INNER DIAMETERS ID

4 JOURNAL BEARINGS SHOWING DAMAGED INNER DIAMETERS ID

FIRST MODE IN 5 DIAMETERS - CENTRIFUGAL IMPELLER

Train of heat-exchangers, condensers, reboilers, superheaters ; Isobutane-column, 50 trays ; Hydrochloric-acid stripper ; Reactor-chillers, 50-inch and 66-inch diameters.