As a boy, Bell built a speaking robot, and found that he could touch his dog's throat in ways that seemed to form his bark and growls into words. Once, he successfully obtained a human ear from a medical school, which he used to conduct experiments tracing sound patterns. Bell was also a gifted pianist, who learned to discriminate pitch very well. As a teenager, he noticed that a chord struck on a piano in one room would be echoed by a piano in another room.He realized that chords could be transmitted through the air, vibrating at the other end at exactly the same pitch.
With this discovery, Bell set out develop a multiple telegraph, using morse code to convey several messages simultaneously, each at a different pitch. He knew his greatest challenge would be finding a way to convey pitch across a wire. He ascertained, eventually,that this could be accomplished by reproducing sound waves in a continuous, undulating current. That's when he realized that this could also apply to human speech, which is composed of many complex sound vibrations.
In 1875,Bell developed his first version of what came to be known as the telephone. He received a patent for it on March 7, 1876, just after his 29th birthday. Five day's later, on March 12, he tested his device, speaking into the phone to his associate, Thomas Watson, when he said, ''Mr. Watson, come here. I want to see you.'' Both of Alexander's brothers, one older and one younger, died from a disease in 1870. The doctors were not sure if Alexander had that disease but luckily he didn't. We should all thank Alexander Graham Bell for inventing the telephone.