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Amos Dolbear

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American physicist (1837-1910)

United StatesScientistsLived 1837 to 1910 · aged 72
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Amos Emerson Dolbear was an American physicist and inventor. Dolbear researched electrical spark conversion into sound waves and electrical impulses. He was a professor at University of Kentucky in Lexington from 1868 until 1874.

Text from Wikipedia, CC BY-SA 4.0

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Circuit of Dolbear's wireless telephone, from his 1882 patent. The transmitter (A) consisted of an electrostatic microphone (T) and battery in the primary circuit of an induction coil (G). One side of the high voltage secondary winding is earthed (C) the other side connected to an elevated capacitance (H1). The receiver (B) consists of a battery, earphone (R) and capacitor (H) connected in series between an elevated capacitor (H2) and earth (D).Circuit of Dolbear's wireless telephone, from his 1882 patent. The transmitter (A) consisted of an electrostatic microphone (T) and battery in the primary circuit of an induction coil (G). One side of the high voltage secondary winding is earthed (C) the other side connected to an elevated capacitance (H1). The receiver (B) consists of a battery, earphone (R) and capacitor (H) connected in series between an elevated capacitor (H2) and earth (D).

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About this person

Amos Emerson Dolbear was an American physicist and inventor. Dolbear researched electrical spark conversion into sound waves and electrical impulses. He was a professor at University of Kentucky in Lexington from 1868 until 1874. In 1874 he became the chair of the physics department at Tufts University in Medford, Massachusetts. He is known for his 1882 invention of a system for transmitting telegraph signals without wires. In 1899 his patent for it was purchased in an unsuccessful attempt to interfere with Guglielmo Marconi's wireless telegraphy patents in the United States.

Text from Wikipedia, CC BY-SA 4.0

Country
United States
Category
Scientists
Type
Scientist
Status
deceased
Dates
Lived 1837 to 1910 · aged 72
Wikipedia
13 languages

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