Heat treatment of front axles of automobiles in the United States.
United States USA Date:1924 Duration:6 min 41 sec Sound:NO SOUND
Heat treatment in automobile manufacture in the United States. Automobiles passing on a street. Exterior of an automobile industry. Men working outside the building. Interior of the building. Automobile parts under construction. The front axle of an automobile. Microscopic view of the axle before heat treatment. Cars moving across a field. Axles are treated in a huge automatic furnace. Interior of a building. Men working on the treatment of axles. Flame is kept away from metal while heating. Heat reaches the axles through numerous small openings. The temperature must be raised slowly and evenly to a specified degree and held there. A man turns a knob. Each furnace is equipped with electric temperature indicators called 'pyrometers'. The temperature is automatically recorded in the control office. Variations in temperature are recorded. Lines being drawn to indicate the variations in temperature. The straightness of the line indicates the uniformity of the temperature. Each furnace has a deviation indicator, showing slightest variation from the specified temperature. The furnaces are also equipped with signal lights. If the temperature gets too high, the red light glows and in case of too low temperature, the blue light glows. The white light indicates correct temperature.
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