the evolution of the input transformer, 1926

“Bell Laboratories – The Evolution Of The Input Transformer By F.E. Field” – see whole series of scans at


  1. Great post !!! Awesome! Interesting. THANKS

  2. Written by “F.E. Field” ??
    Is this a joke or just a hilarious coincidence? ๐Ÿ˜€ (Fe = iron, Field = magnetic flux)


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