Charles Grafton Page
in 1840, he passed an electric current through a coil wire placed between the poles of a horseshoe magnet, observing that connecting and disconnecting the current caused a ringing sound in the magnet, later calling it "galvanic music".
in 1840, he passed an electric current through a coil wire placed between the poles of a horseshoe magnet, observing that connecting and disconnecting the current caused a ringing sound in the magnet, later calling it "galvanic music".
Innocenzo Manzetti
as early as 1844, he considered the idea of the telephone and may have made on in 1864. Being an enhancement to an automaton built buy him in 1849, he is considered by many as the inventor of the telephone.
as early as 1844, he considered the idea of the telephone and may have made on in 1864. Being an enhancement to an automaton built buy him in 1849, he is considered by many as the inventor of the telephone.
Charles Bourseul
he was a French telegraph engineer who proposed the first design of a make-and-break telephone in 1854. At this time, Meucci had just created his first attempt at the telephone. Charles had proposed a good idea about vibrations of the voice traveling from one disc to another, yet he soon died and his thoughts went wit him.
he was a French telegraph engineer who proposed the first design of a make-and-break telephone in 1854. At this time, Meucci had just created his first attempt at the telephone. Charles had proposed a good idea about vibrations of the voice traveling from one disc to another, yet he soon died and his thoughts went wit him.
Johann Phillip Reis
in 1860 Reis was the first to produce a functioning electromagnetic device that could transmit musical notes, instinct speech and sometimes distinct speech by electric signals. He had also introduced "telephon" for his device. The first sentence spoken was, (translated) "the horse doesn't eat cucumber salad". Reis's transmitter was a diaphragm attached to a needle and pressed against metal contact, resembling the make-and-break system of Bourseul. His transmitter was very difficult to operate since the position of the needle was critical to the operation. It was confirmed that his transmitter could only faintly transmit and receive speech.
in 1860 Reis was the first to produce a functioning electromagnetic device that could transmit musical notes, instinct speech and sometimes distinct speech by electric signals. He had also introduced "telephon" for his device. The first sentence spoken was, (translated) "the horse doesn't eat cucumber salad". Reis's transmitter was a diaphragm attached to a needle and pressed against metal contact, resembling the make-and-break system of Bourseul. His transmitter was very difficult to operate since the position of the needle was critical to the operation. It was confirmed that his transmitter could only faintly transmit and receive speech.
Antonio Meucci
an early voice communicating device was invented in 1854 by Meucci called a telettrofono. He had claimed to have invented a paired electromagnetic transmitter and receiver where the motion of a diaphragm modulated a signal in a coil by moving an electromagnet. In the 1880's he was credited with the early invention of inductive loading of telephone wires to increase long distance signals. Meucci worked on more than 30 kinds of sound transmitting devices inspired by the telegraph.
an early voice communicating device was invented in 1854 by Meucci called a telettrofono. He had claimed to have invented a paired electromagnetic transmitter and receiver where the motion of a diaphragm modulated a signal in a coil by moving an electromagnet. In the 1880's he was credited with the early invention of inductive loading of telephone wires to increase long distance signals. Meucci worked on more than 30 kinds of sound transmitting devices inspired by the telegraph.
The evolution of the telephone
Resources; http://www.loc.gov/rr/scitech/mysteries/telephone.html
http://www.uh.edu/engines/epi1098.htm
http://www.uh.edu/engines/epi1098.htm