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A U.S. ship carrying navy personnel leaves a harbor and gets underway at sea in the United States.
Men at a harbor in the United States. A ship docked in the harbor. U.S. Navy personnel aboard the ship. Some men standing near the ship on the dock. The ship leaves the harbor and gets underway at sea. Smoke from the ship stacks. Mountains in the background.
Safety techniques and measures used by the people in the United States.
A film titled 'Seconds for Survival' depicts the techniques used by people in case of emergency for their safety in the United States. American actor Raymond Hart Massey talks about the safety techniques. Men aboard sailing boats underway at sea. Warning about an upcoming storm in the sea arises on a teletypewriter. Sailors aboard a motorboat warns the people about the storm. Everybody is safe because of the quick warning and actions. Men and women working in a bank. A man arrives at the counter and shows a pistol to the employee during a bank robbery. He asks him to give all the money. The employee presses the button of a silent alarm to call the police. The man comes out of the bank with the money. The police arrives in time and captures the criminal.
Members of the weather bureau working to collect and record the weather information in the United States.
A film titled: 'Flood weather' on the working of weather bureau in the United States. Snow covered area. Mountains in the foreground. The weather bureau gathers information about the weather and gives early warnings to people. A map locates different areas. A member of the weather bureau working to collect the information. He reads and records the information with the help of gauges. A man working with the help of cable and transmitter. The information is recorded for the purpose of providing the same, as and when required. The exterior of a building. A ship underway at sea. Smoke from the stacks of the ship. A map locates different areas.
The demonstration of the principles of the steam power in the United States.
A film titled: 'The Magic of Steam' depicts the working of the steam turbines in the United States. A woman seated in her room turns the light on. Men work inside a factory. Electric poles in an area. Wires connected from one electric pole to the other. A pie chart depicts the power used for the production of electricity. 65 percent of steam and 30 percent of water being used for the purpose. Men work inside a factory. They work on steam turbine. A man demonstrates the working of a steam turbine using the steam. A man places a tea kettle to heat. Steam arising out of the kettle as the water boils. A paddle wheel is placed near the kettle from which the steam comes out. The wheels start revolving due to the steam. A lid is placed on the kettle. The high pressure of steam lets the wheels to revolve faster and pushes the kettle in the opposite direction. The lid is then removed from the kettle. Another example to demonstrate the concept of steam is that of the fire hoses. Firemen try to control the fire in a building with the help of fire hoses. Men work near a steam turbine in a factory. (World War II period).
The use of steam power by the steam turbine in the United States.
The working of the steam turbines in the United States. A drawing depicts the first stage of the working of the steam turbine. The steam jets strike the blades of the turbine. The blades receive the steam and change their direction. The spindles are driven through the process. A man demonstrates the working of the steam turbine through the tea kettle. A tea kettle is placed to boil the water. The steam comes out of the kettle and revolves the paddle wheel kept nearby. The impulse stage of modern steam turbine being demonstrated. The blades being forced to move due to the pressure of the steam. The direction of steam is changed and it gives more power to the revolving spindles. A man works on the steam turbine. Steam coming out of a tea kettle. The steam moves through stationery blades first and then through the blades in motion. The steam enters from the boiler to the turbine. It then passes through the nozzle. The quantity of the steam at this stage should be constant. The turbine rotates because of the steam and it turns the shaft. The centrifugal force works at this time. The valve in the turbine opens. The small piston moves down. The large piston moves upwards. The force moves the valve. The speed of the turbine is decreased. The quantity of steam is increased and the speed thus increases.
The use of larger blades to allow the proper expansion of steam inside the turbine in the United States.
The working of the steam turbines in the United States. Steam turbines in a factory. The previous steam turbines faced the problems of speed control. The modern steam turbines are thus directed through larger sized blades. The longer and larger blades being used for the expansion of steam efficiently. The blades operate in high ad low pressure. Steam enters from the boiler to the turbine. It is regulated by the control valve inside the turbine. The steam strikes the blades inside the turbine and the blades move. The longer and larger blades allow the steam to expand efficiently. Man works on the steam turbine.
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