Alexander Graham Bell is most well known ... Watson, one of Bell's assistants, was trying to reactivate a telegraph transmitter. Hearing the sound, Bell believed that he could solve the problem ...

ALEXANDER GRAHAM BELL:'It had a mouthpiece, or transmitter, to speak into, then using a dangerous liquid called acid, the sound would be urned into electricity, travel along a copper wire ...

In May, 1878, Mr. Alexander Graham Bell, will known in connection with ... The beam proceeding from the transmitter is received at a distant station upon a parabolic reflector, in the center ...

Alexander Graham Bell demonstrated his new ... worked with his team to develop a device that trumped Bell’s, the carbon-button transmitter, just a few months later.