Microphone Typewriter Braille Sewing Machine Inventions Microphone Charles Wheatstone was the first to invent the microphone, in the form of a cone, which mechanically transfers the sound vibrations into an earpiece so the sound can be heard. Wheatstone then left the study of sound to work on the electric telegraph. After many renovations, some made …
Daily Archives: September 29, 2020
Protected: English Lesson #25-30: Our Home
There is no excerpt because this is a protected post.