Inventions have been the product of experiment and work based on physical reasoning...

Anyone who has had actual contact with the making of the inventions that built the radio art knows that these inventions have been the product of experiment and work based on physical reasoning, rather than on the mathematicians' calculations and formulae.  Precisely the opposite impression is obtained from many of our present day text books and publications. — Edwin Armstrong
Drawing of Edwin H. Armstrong
Edwin H. Armstrong

Edwin H. Armstrong invented the regenerative circuit, superheterodyne circuit, superregenerative circuit, and FM radio. 


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