The records is like a spiral, only instead of nice curvy lines, the lines are more squiggly. The needle drags against these squiggly lines and it vibrates the needle. That needle vibration is then transferred to the horn. The horn vibrates the same as the needle but the horn amplifies the vibration and that vibration in turn vibrates the air. This vibration of air is sound.
A phonograph is a device that reproduces recorded sound is called a phonograph or 'gramophone' and it was invented by Thomas Alva Edison in 1877. His model consisted of a metal cylinder covered with tinfoil which was mechanically rotated. When the... read more