This week in History
On March 7, 1876, 29-year-old Alexander Graham Bell receives a patent for his revolutionary new invention-the telephone. With the help of Thomas A. Watson, a Boston machine shop employee, Bell developed a prototype. In this first telephone, sound waves caused an electric current to vary in intensity and frequency, causing a thin, soft iron plate-called the diaphragm-to vibrate. These vibrations were transferred magnetically to another wire connected to a diaphragm in another, distant instrument. When that diaphragm vibrated, the original sound would be replicated in the ear of the receiving instrument. Three days after filing the patent, the telephone carried its first intelligible message-the famous "Mr. Watson, come here, I need you"-from Bell to his assistant.
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