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China 1924 stock footage and images
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Hawaiian fishermen pull a net out of water at an island in Hawaii, United States.
An island in Hawaii, United States. Hawaiian fishermen at a shore. The fishermen pull a net from water. A fisherman holds a fish.
People enjoy and surf at Waikiki Beach in Honolulu, Hawaii.
Waikiki Beach in Honolulu, Hawaii. Swimmers enjoy at Waikiki Beach. Boys run into the waves from shore. Various views of men surfing in the waters off the beach on surfboards. Surfing shots includes closeup view of Duke Kahanamoku (Duke Paoa Kahinu Mokoe Hulikohola Kahanamoku) riding a surf board. Kahanamoku is often credited with popularizing the Hawaiian sport of surfing.
Kilauea volcano in Hawaii, United States shows molten rock and constantly boiling lava.
Waikiki Beach in Honolulu, Hawaii. Animated map depicts the location of Kilauea volcano in Hawaii. The crater of Kilauea filled with molten lava. Roads being made on cooled lava. Men jump over lava crack. Vapors rise from lava. A lake of molten rock. Men standing at the edge of lava. The molten lava is constantly boiling, Molten rock glow at night. View of Kilauea volcano.
A laboratory demonstration in the U.S. showing varying properties which can be imparted by heat treating pieces of steel.
A film titled: 'The story of heat treatment of steel' on the heat treatment of steel in the United States. Interior of a laboratory. Varying properties which can be imparted by heat treating different pieces of a steel rod are demonstrated. A man seated at a desk. He stands up and holds a rod of untreated steel. The rod is treated using different heat treating methods. Four treated rods are placed on a table. One of the rod becomes extremely hard. Another rod becomes very soft. The third rod can be bent double without destroying the steel structure. The fourth rod is extremely elastic. A diagram depicts physical properties of steel.
Heat treatment of front axles of automobiles in the United States.
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.
Processing and cooling of axles in an oil bath during heat treatment of metal in the United States.
The heat treatment of front axles of automobiles in the United States. Interior of a building. The axles slowly move through a furnace with the temperature gradually increasing. The temperature is held at a point for 15 minutes to ensure absolute uniformity. The axles automatically descend into an oil bath after this process. The oil must be kept at the proper temperature to give the steel maximum strength. The oil temperature is recorded in the control office. The oil is cooled by cold water pipes. The water is cooled by fountain sprays. A storage tank replaces the oil. Cooling of the axles in the oil bath. This completes the first step of heat treatment called hardening. Metal at this stage is viewed under a microscope. Comparison of the appearance before and after hardening. Tempering of the metal to relieve the strains set up during the hardening process.
