Sand rock and silica sand being quarried by blasting and being broken down and cleaned before transporting to a glass plant in United States for manufacturing safety glass. Various raw materials like sand, limestone, soda ash, charcoal and salt cake are put in a furnace, moved about, blown, and afterwards melted to roll out sheets of glass.
Sheets of glass are picked up by suction cups and placed on grinding table at a factory in United states. Grinding and polishing takes place twice.
After polishing and grinding, sheets of glass are washed with acid and water. These sheets are then cut into special shapes at a safety glass factory in United States. A cellulose acetate sheet is placed between two glass sheets and rollers are moved over it. Sheets are heated at 300 degrees Fahrenheit and subjected to 200 pounds of pressure before final polishing and grinding. After this, safety glass is ready for installation.
Triplex glass plates are placed in plaster of paris in a factory in United States. Processes of production and conveyor belt system for the production steps are shown. Shows plates polished with sand, rouge and other materials, and cleaned with acid. They are cut to size.
A film titled 'Making of rubber tire' shows the manufacturing process of a rubber tire in a factory in United States. Raw rubber in form of biscuits and mats from Ceylon being washed and dried. Zinc, sulphur and lamp black are added for color and strength. Rubber is placed on metal cylinders and vulcanized at 300 degrees Fahrenheit and processed further to obtain rubber tire.
Thread making machine in operation in a factory in United States. Threads move over a huge machine and rolls of thread attached to one end of the machine. Cloth being made from thread at the factory.
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