Daily LIFT #1919

Giant Industrial Frequency Heat-Treatment Equipment, People's Republic of China, 1968 -- Daily LIFT #1919

From the Chinese press, 1968:

A hundred-ton rolling-mill roll standing high as a two-storey building and so big that four men can touch outstretched arms around it, moved along swiftly on an overhead travelling crane and dropped easily into the opening of the heat-treatment tower. As red and green lights on the control panel flashed, the giant roll was rapidly turned, to be heated and quenched. The ten-metre-high tower, the largest piece of equipment for heat treatment using industrial frequency electric power built in China to date, was made last year during the great cultural revolution by the Shanghai Heavy Machinery Plant.