WESTWARD EXPANSION INDUSTRIALIZATION URBANIZATION 1870 1900
SECOND INDUSTRIAL REVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Phonograph
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cash register
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telephone
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lightbulb
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Detailed explanation-1: -That changed in 1877 when Thomas Edison unveiled his phonograph. It wasn’t the first such device to record and play back audio, but it was the first generally reliable one: scratchy and nearly inaudible by modern standards, but it worked.
Detailed explanation-2: -The phonograph was developed as a result of Thomas Edison’s work on two other inventions, the telegraph and the telephone.
Detailed explanation-3: -How does a phonograph work? Sound is collected by a horn that is attached to a diaphragm. The sound causes vibrations in the air that travel down the horn causing the diaphragm to vibrate. The diaphragm is connected to a stylus and pressed into a cylinder covered in wax (or alternatively a thin layer of tin foil).