First telephone

Hi guys,
Alexander graham bell (1847-1922) is often called the father of the telephone. He was born in Edinburgh, Scotland, moved to Canada in 1870, and later to the USA. He became an expert on the science of speech and his first inventions helped deaf people to hear sounds. During his research, bell developed a method of transmitting voice messages along a wire. In 1876 he patented the device, which is called the harmonic telegraph. This was the first telephone .Thank you.