Description given on Youtube:
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“Discusses the importance of taking good care of automotive electrical systems. Provides step-by-step guidance on tests to run. Animated diagram of the individual components of the electrical system.”
Public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
http://creativecommons.org/licenses/by-sa/3.0/
https://en.wikipedia.org/wiki/Inductive_discharge_ignition
Inductive discharge ignition systems were developed in the 19th century as a means to ignite the air-fuel mixture in the combustion chamber of internal combustion engines. The first versions were low tension coils, then low-tension and in turn high-tension magnetos, which were offered as a more effective alternative to the older-design hot-tube ignitors that had been utilized earlier on hot tube engines. With the advent of small stationary engines; and with the development of the automobile, engine-driven tractors, and engine-driven trucks; first the magneto and later the distributor-type systems were utilized as part of an efficient and reliable engine ignition system on commercially available motorized equipment. These systems were in widespread use on all cars and trucks through the 1960s. Manufacturers such as Ford, General Motors, Chrysler, Citroen, Mercedes, John Deere, International Harvester, and many others incorporated them into their products. The inductive discharge system is still extensively used today…
Faraday’s Law
The inductive-discharge ignition system operates according to the rules of electromagnetism described by Faraday’s Law of Induction which states that the induction of electromotive force (emf) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit…
Magnetos
A magneto is one of the electromechanical devices invented for the purpose of ignition with gasoline internal combustion engines. A magneto at its most basic is a simple magnet that moves next to a wire, or sometimes a wire moves next to a magnet. As they move in relation to each other, the changes in direction of magnetic force induce an electric current in the wire. Usually the wire (called a primary wire) is very long, and looped around an iron magnetic core that more or less channels the magnetic field through the loop of wire. As the current flows, the wire loops develop their own magnetic field, which takes a certain amount of energy to form. The magnetic field is a type of potential energy. There is usually some sort of device that opens and closes the circuit called a contact breaker, points or an ignitor…
Some magnetos have a second coil of wire located next to the first, called a secondary coil…
Due to their reliability, magnetos are used as ignition systems on aircraft…
Distributor Ignition Systems
As ignition technology developed, engineers realized that a functional ignition system could be designed that dispensed with the magnets altogether. By applying a current to a primary wire loop wrapped around an iron magnetic core, a magnetic field would be generated in the primary loop without the magnets. This magnetic field would induce a current in an adjacent longer secondary loop of wire. By opening the circuit in the primary loop, the collapsing magnetic field would cause a voltage to be induced in the secondary loop. This high voltage was carried or “distributed” by a distributor to each of the multiple spark plugs in a gasoline car or truck engine.
The most familiar version of this kind of system was invented by Charles F. Kettering in about 1909 and was known by some as the Delco ignition system. Later patent applications to the US Patent Office make reference to the “Kettering ignition system”. This type of ignition system was used on automobiles, trucks, lawn mowers, tractors, chainsaws, and other gasoline-powered machinery with great success for many decades until the development of capacitive-discharge ignition systems.