Railways | 1940 | Sound | B/W
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Electro - Magnetic Induction. Opens with scenes of old LSWR electric stock in Southern Railway days, probably at Motspur Park. There is also an 00 gauge layout with a model of the Brighton Belle.
An electric train on a rail track somewhere in Britain. Another electric train going past a road rail crossing. Another electric train pulling into a station. Partial view of a model railway layout Southern railway showing a train stopped at the station. The model train runs on the tracks. A boy is playing with the model railway. Close up of the electric circuit used to control the model railway. The boy turns on a switch and bends over the railway model to look at the lamp that was turned on in the signal box. Close up of the signal box lifting up on and off. Close up of the wires leading from the signal box to the switch. Diagrammatic representation of the signal box connected to a low voltage battery. Diagrammatic representation of an electric circuit describing how a lamp can be turned on and off. Close up of a pair of hands handling an electrical wire, the wire is cut in half and both ends are used to light a lamp. The ends of the wire are connected to a galvanometer and electric current can be recorded. Diagrammatic representation illustrating the uses of a galvanometer e.g. measuring the direction and strength of an electric current. Close up showing two ends of a wire connected to a galvanometer which indicates the direction and strength of the electric currents, when the ends are changed the galvanometer indicates that the current flows in the opposite direction. Close up of the model railway signal box. A young boy is turning on the power to the model railway, he also turns the control panel signal switches. View of the signal switches being turned on the control panel, at the same time the signal at the edge of the track is operated. Close up of the signal at the edge of the track, at its base there is a coil of wire wrapped around a rod. Close up of the signal being pulled up or down depending on whether there is current on the rod. Close up of a large coil and of a piece of rod connected to a switch, when the current is switched on the rod is driven into the coil, when the current is switched off a spring drives back the rod from the base of the rod. Diagrammatic representation illustrating how the current drives the rod up and down, the current creates a magnetic force within the coil, thus driving the rod onto the base, thus turning the signal on. Close up of the coiled wire which is usually termed a solenoid. Close up of a bar magnet attracting a bunch of screws and a bunch of nails. Close up of a campus needle placed between a bunch of nails and a bunch of screws, the bar magnet makes the needle move. Close up of the bar magnet. A paper is placed over the bar magnet and iron-filings dusted onto the paper which reveals the location of the magnetic field. Close up of the magnetic field. Close up of a solenoid which can act as a magnet, the solenoid has a magnetic field only when the electric current is switched on. A paper is placed over the solenoid and iron-filings are dusted over the paper. The current is switched on making the iron-filings shift to reveal the magnetic field. Close up of the magnetic field representation of the solenoid and of the magnetic bar. An electric wire is passed through the middle of a white paper sheet and then connected to a switch, iron-filings are dusted onto the paper, the current is switched on and again a magnetic field is revealed. Diagrammatic representation of an electric wire's magnetic field. View of the campus needle moving as a wire is placed over it. Close up of a galvanometer, a solenoid and of a magnetic rod. Close up of the magnetic rod. Close up of the solenoid. Close up of a galvanometer. Close up of the solenoid coil being connected to the galvanometer, the magnet is then pushed in and out. Close up of the galvanometer reading current as the magnetic rod is pushed in and out of the coil (solenoid), when the magnet is left still in the coil there is no current, there is only current when the magnet is moved in and out. Diagrammatic representation illustrating where the magnetic field is stronger and where it is weaker within the solenoid. diagrammatic representation illustrating what happens when we move the magnet into and out of the solenoid. The same experiment but now moving the wire instead of the magnet. Diagrammatic illustration of the wire being moved between the magnet. The same experiment but now using a coil of wire passing between the magnet. Close up of the coil of wire moving between the magnet poles. Diagrammatic representation illustrating the current and magnetic field produced by the coiled wire placed revolving between the magnetic poles, this gives rise to electromagnetic induction, all electric generators make use of this process. Diagrammatic representation illustrating electromagnetic induction. View of an industrial generator, which is made to spin by the power of steam engines. An electric power station. An electric power station waterfall. An electrical generator. High voltage power cables across a field. Close up of high voltage power cables. Close up of the model railway steam engine that provides energy to run the model railway. View of the boy playing with the model railway. View of the signal box and of the train leaving the station. Diagrammatic representation illustrating how the electric train operates. Close up of the model train's electric locomotive. View of the train running on the model railway tracks. An electric train, T 4223, Southern railway, out of a station.
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