Archie Frederick Collins, who generally went by A. Frederick Collins, was a prominent early American experimenter in wireless telephony and prolific author of books and articles covering a wide range
Collins conducting experiment to use a human brain as a radio wave detector
Collins demonstrating an induction wireless telephone (circa 1903)
Advertisement for the Collins wireless phone for automobiles.
Nathan Beverly Stubblefield was an American inventor best known for his wireless telephone work. Self-described as a "practical farmer, fruit grower and electrician", he received widespread attention
Stubblefield (1908) with his later, induction, wireless telephone
Nathan Stubblefield using his ground-current wireless telephone to receive a March 1902 test transmission at Washington, D.C.