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 ...

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:'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 ...

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.