THE use of electricity on aircraft commenced with the essential need of an electric spark to ignite the fuel charge in engine cylinders just as in the case of other mechanically propelled vehicles. Where a coil was used and not a magneto, or a number of navigation or other lights were — required, it was necessary to provide a secondary storage battery for the purpose of supplying current for a limited duration. Fortunately for the “power supply” of those days, the duration was often curtailed by some other factor such as engine failure or low fuel load, if nothing worse happened to reduce the flying time.
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