Alexander graham bell when was the telephone invented

The following year, he settled in the United States. While in the U. In , he opened the School of Vocal Physiology and Mechanics of Speech in Boston, where deaf people were taught to speak.

While teaching, Bell met Mabel Hubbard, a deaf student. The couple married on July 11, They went on to have four children, including two sons who died as infants.

In , Bell started working on the harmonic telegraph — a device that allowed multiple messages to be transmitted over a wire at the same time. While trying to perfect this technology, which was backed by a group of investors, Bell became preoccupied with finding a way to transmit human voice over wires. By , Bell, with the help of his partner Thomas Watson, had come up with a simple receiver that could turn electricity into sound.

On March 7, , Bell was granted his telephone patent. Watson, come here. I want you. In , the U. In addition to the telephone, Bell worked on hundreds of projects throughout his career and received patents in various fields. Some of his other notable inventions were:. In , Bell was awarded the French Volta Prize, and with the money, he founded a facility devoted to scientific discovery, the Volta Laboratory in Washington, D.

Bell invented numerous techniques to help teach speech to the deaf and even worked with well-known author and activist Helen Keller. The drawback of the telegraph, however, was that it still required hand-delivery of messages between telegraph stations and recipients, and only one message could be transmitted at a time. With the help of Thomas A. Watson, a Boston machine shop employee, Bell developed a prototype. In this first telephone, sound waves caused an electric current to vary in intensity and frequency, causing a thin, soft iron plate—called the diaphragm—to vibrate.

These vibrations were transferred magnetically to another wire connected to a diaphragm in another, distant instrument. When that diaphragm vibrated, the original sound would be replicated in the ear of the receiving instrument. But if you see something that doesn't look right, click here to contact us!

The day's events became known as "Bloody Sunday. Prior to Bigelow, only three women had been nominated for a best director The following day, the battle ended in defeat for the Confederates. Today the vast majority of all our telecommunication travels the globe at the speed of light along fibre optic cables. In November , Bell returned to Edinburgh for a visit.

Alexander Graham Bell died on 2 August aged On the day of his funeral the telephone systems in the US and Canada were silenced for one minute. By National Museums Scotland. Phone listing National Museums Scotland. Model of larynx National Museums Scotland. Illustration of Bell's equipment used National Museums Scotland. Hearing the sound, Bell believed that he could solve the problem of sending a human voice over a wire.

He figured out how to transmit a simple current first, and received a patent for that invention on March 7, Five days later, he transmitted actual speech. Sitting in one room, he spoke into the phone to his assistant in another room, saying the now famous words: "Mr. Watson, come here.

I need you. Bell had other inventions as well -- his own home had a precursor to modern day air conditioning, he contributed to aviation technology, and his last patent, at the age of 75, was for the fastest hydrofoil yet invented.

Bell was committed to the advancement of science and technology.