I would say the wire coil since thuis simple littel item is tremendously versatile and is used in radios, in electromagnets, in tuned circuits etc.. The electromagnet was essential in the operation of the morse code telegraph used in the old West. Its importance was parallel to the steam locomotive.......
wow, that's going back a way ! I would say the wire coil since thuis simple littel item is tremendously versatile and is used in radios, in electromagnets, in tuned circuits etc.. The electromagnet was essential in the operation of the morse code telegraph used in the old West. Its importance was parallel to the steam locomotive.
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