Question

Recording is a form of _____ sources of history

Answer 1

Answer: Recording is a written form of sources of history

Explanation:

Answer 2

The Answer is:

Recording is a form of AUDIO sources of history.

A form of audio source of history is recording. In the current era, recordings of speeches by leaders or notable persons, music, and so on are available. They can be used as a historical resource.

• The narrative of sound recording and reproduction began in 1877, when Thomas Edison, the man with a thousand patents, invented the phonograph.
• In essence, his machine was a sheet of tinfoil wrapped around a cylindrical drum that rotated and moved laterally when turned by a handle.
• As it moved, it came into contact with a metal stylus attached to one side of a diaphragm.
• The operator talked into a small mouthpiece on the other side of the diaphragm.
• Sound waves focused on the diaphragm made it to vibrate, causing the stylus to alter its pressure on the tinfoil.
• As the drum rotated and moved across the stylus, a groove in the tinfoil was imprinted with undulations that approximated the pressure patterns of the sound-waves.
• Playback entailed rewinding the cylinder and putting the stylus at the beginning of the groove produced during recording.
• The undulations in the tinfoil caused the stylus to move in and out, causing the diaphragm to vibrate, which caused the air in the mouthpiece to move, thereby reproducing the sound.

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