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Nathan Stubblefield
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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
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.
Nathan Stubblefield using his ground-current wireless telephone to receive a March 1902 test transmission at Washington, D.C.
Photophone
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The photophone is a telecommunications device that allows transmission of speech on a beam of light. It was invented jointly by Alexander Graham Bell and his assistant Charles Sumner Tainter on Februa
A historical plaque on the side of the Franklin School in Washington, D.C. which marks one of the points from which the photophone was demonstrated
A historical plaque on the side of the Franklin School in Washington, D.C. which marks one of the points from which the photophone was demonstrated
A diagram from one of Bell's 1880 papers
A diagram from one of Bell's 1880 papers
A photophone receiver and headset, one half of Bell and Tainter's optical telecommunication system of 1880
A photophone receiver and headset, one half of Bell and Tainter's optical telecommunication system of 1880
Illustration of a photophone transmitter, showing the path of reflected sunlight, before and after being modulated
Illustration of a photophone transmitter, showing the path of reflected sunlight, before and after being modulated