- #1
physicsgal
- 164
- 0
help!
here's what i have. this does some what explain how magnetic fields were used to invent the telephone? I am not sure what else to put.
"In 1977 Bell patented a telephone that uses an electromagnetic transmitter. This invention works similarly to the variable-resistance transmitter (described in part A), but uses an electro-magnet and not acidic water. This invention consists of an electro-magnet using permanent magnet, a battery, a plate of iron or steel for use as a diaphragm (or any material capable or inductive action), and a call ball. The main feature of this invention consists in the armature of the receiving-instrument being vibrated by the varying attraction of the electro-magnet which vibrates the air in the same manner at both the receiving and transmitting end of the telephone. The magnet is coiled at both ends (which end is a pole) and is positioned as close to the plate as possible, without actually touching.
When a person speaks into the mouthpiece, the iron diaphragm vibrates with the voice in the magnetic field of the pole, this excites the currents in the coil. These currents travel through wires to another telephone. This subsiquently effects the magnetism in the pole of the receiving telephone, and makes the armature vibrate with makes the sound of the original voice. "
does that pretty much make sense? and get to the point?
any input is appreciated!
~Amy
here's what i have. this does some what explain how magnetic fields were used to invent the telephone? I am not sure what else to put.
"In 1977 Bell patented a telephone that uses an electromagnetic transmitter. This invention works similarly to the variable-resistance transmitter (described in part A), but uses an electro-magnet and not acidic water. This invention consists of an electro-magnet using permanent magnet, a battery, a plate of iron or steel for use as a diaphragm (or any material capable or inductive action), and a call ball. The main feature of this invention consists in the armature of the receiving-instrument being vibrated by the varying attraction of the electro-magnet which vibrates the air in the same manner at both the receiving and transmitting end of the telephone. The magnet is coiled at both ends (which end is a pole) and is positioned as close to the plate as possible, without actually touching.
When a person speaks into the mouthpiece, the iron diaphragm vibrates with the voice in the magnetic field of the pole, this excites the currents in the coil. These currents travel through wires to another telephone. This subsiquently effects the magnetism in the pole of the receiving telephone, and makes the armature vibrate with makes the sound of the original voice. "
does that pretty much make sense? and get to the point?
any input is appreciated!
~Amy