\\1. the telaphone
2. 1876
3. Elisha Gray and Alexander Graham Bell
4. 
"Knowing the sound give off waves, like ripples in the water, they travel into the mouth piece there the sound waves are copied by the trasmitter behind the transmitter are carbon grains that when an electric current is traveling makes the grians vibrate and that alters the resistance of the grains as a whole. In this way the sound makes more and less current flow in the circuit in proportion to the sound.At the other end was a coil of wire within a magnet attached to a diaphram. The variations in current caused the wie tomove in the magnetic field and so make the diaphram vibrate in sympathy. Vibrations (as we learnt at the beginning) move air and this makes sound!" before the telephone people used to hire people to cary letters back and forth and people also used to use the telegraph
"Knowing the sound give off waves, like ripples in the water, they travel into the mouth piece there the sound waves are copied by the trasmitter behind the transmitter are carbon grains that when an electric current is traveling makes the grians vibrate and that alters the resistance of the grains as a whole. In this way the sound makes more and less current flow in the circuit in proportion to the sound.At the other end was a coil of wire within a magnet attached to a diaphram. The variations in current caused the wie tomove in the magnetic field and so make the diaphram vibrate in sympathy. Vibrations (as we learnt at the beginning) move air and this makes sound!" before the telephone people used to hire people to cary letters back and forth and people also used to use the telegraph5. the telophone made it alot easyer for people to camunicate and it made it so that people could travel and still stay in contact with eachother
6. some people liked it and some people didn't like it
7. in the 1870's there where some innovations in dentistry there where also innovations in electricity steel and skyscrapers
