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Shanghai China 1925 stock footage and images
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Manufacture of dynamite and its principle ingredient nitroglycerin in the United States.
A film on manufacture of dynamite in the United States. Nitrate of soda is brought from South America and is used in crystalline form as an ingredient of dynamite. Men working for the manufacture of dynamite. A ship at a port. Men unloading sacks from the ship. Wood pulp is also used as a raw material in the manufacture of dynamite. The other material used is the nitrate of ammonia. Nitrate of soda is converted into nitric acid. It is dumped into huge retorts and is treated with sulphuric acid. Nitric acid vapors are condensed to a liquid in tiers of water-cooled glass pipes. Nitric acid is used to make nitroglycerin which is one of the most powerful explosives. Exterior of a building. Mixed nitric and sulphuric acid is run into a nitrator and refined glycerin is slowly added. The operator watches the thermometer as the chemical reaction releases an enormous amount of heat. An explosion can occur if the heat is not carefully controlled. He also watches the charge through a sight glass. Nitroglycerin and waste acids flow from the nitrator into a lead-lined trough which leads to a separator. The nitroglycerin rises to the top as the mixture settles. Then it is washed and led into storage tanks. It is transported to a dynamite mixing house in a rubber-lined and rubber-tired cart. Men working inside the building. A proper amount of the dry ingredients is poured into a mixing machine. Nitroglycerin is added to it. The mixture is further processed under revolving rubber-shod wheels.
Manufacture of shells and packing of dynamite in a factory in the United States.
A film on manufacture of dynamite in the United States. Manufacture of shells which contain dynamite. The shells are made by a machine which cuts paper from a roll, prints it, rolls it into a cylinder and folds one end. Men working in a building. They work on several machines and equipment. The shells pass through an oven where they are sprayed with paraffin. Dynamite is fed into the back of a cartridge-packing machine on an endless belt. Men working inside the factory. Shells are fed into a shuttle. Packed cartridges are delivered.
Manufacture of gelatin dynamite and its packaging for use in the United States.
A film on manufacture of dynamite in the United States. Gelatin dynamite is manufactured. Nitroglycerin is first run into a bronze bowl equipped with paddles for the manufacture of gelatin dynamite. Men working inside a factory. Then nitrocotton is added. When this mixture is stirred, nitroglycerin is gelatinized by nitrocotton. This gives the explosive its plasticity and water-resisting power. Other dry ingredients are added and mixing continues. Men remove the finished gelatin with wooden scoops to eliminate the possibility of striking a spark from the metal. It is fed on a belt to a gelatin cartridging machine. It is packed into paper shells. Certain types of dynamite are dipped in metal paraffin for additional waterproofing. The dynamite is packed.
Buildings and area comprising of a dynamite plant in the United States.
A film on manufacture of dynamite in the United States. A dynamite plant. Safety area includes administration buildings and non-hazardous operations. A high altitude view of the area.
Testing of dynamite in a laboratory in the United States.
A film on manufacture of dynamite in the United States. Laboratories for testing and research of dynamite. A chemist working in a laboratory. He tests every ingredient and every finished lot of material. Tests for sensitiveness and velocity are conducted. For conducting a test, gaseous and dusty conditions similar to those found in some coal mines are created. Explosives are fired in it to make sure that they will not ignite gas or dust before they are sent to the U.S. Bureau of Mines for approval as permissible explosives.
Packing of dynamite for shipment to several places in the United States.
A film on manufacture of dynamite in the United States. The packing of dynamite. Men packing the dynamite for shipment. Boxes should be tightly packed to prevent shifting or breaking in transit. Specially constructed trucks carry dynamite. A driver boards a truck.
