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Warehouse view of cord stock. Cord stock as it is received from the mill. This special twist cotton cord comes from southern mills. It differs from other tire cords in that it is woven and twisted by gear-driven machinery instead of belt-driven equipment. Slips and strains of belt-machinery are reflected in the cord and on into the finished tire, whereas in a gear-driven machine there are no slippages, therefore no weakened cords in the finished tire. Firestone (General Tires), Akron, Ohio

Warehouse view of cord stock. Cord stock as it is received from the mi...

Public domain photograph of United States agriculture in the 1930s, country, farmer, farm, great depression, migration, dust bowl refugees, free to use, no copyright restrictions image - Picryl description

[Reproduction of page from notebook of Leonardo da Vinci showing a water-powered, gear-driven machine for manufacturing cannon barrels]

[Reproduction of page from notebook of Leonardo da Vinci showing a wat...

Illus. in: Il codice atlantico di Leonardo da Vinici nella Biblioteca ambrosiana di Milano. Milano : U. Hoepli, 1894-1904. Published in: The tradition of technology : Landmarks of Western technology ... / Leon... More