New Life In Heavy Industry -- Those who associate heat-treatment with gloomy, oily, overheated shops can learn here that the process can be conducted with cleanliness and tidiness. A large volume of gears, shafts, and spindles, etc., passes through these evens day, although production is maintained, great care goes into the appearance and cleanliness of the shop, even to the regular painting of the furnaces. September 03, 1951. (Photo by British Official Photograph).