The Invention of Telephone

The telephone was invented by Bell in 1876 and is a communication device that transmits sound through electrical signals, allowing people to engage in real-time long-distance voice communication. This invention greatly changed the way people communicate, promoting connections between business, society, and individuals.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

In an experiment, Bell found that when current starts and stops flowing on a spiral coil of copper wire, the coil produces noise and can transmit music through it, but it cannot carry human speech. Bell was inspired by this and realized that in order to transmit a person's voice, a continuous electric current must be generated to make the tone vibrate, just like how an airflow generates sound waves by vibrating the voice. That is to say, he must use radio waves instead of sound waves to transmit speech. After countless experiments, on March 10, 1876, Bell shouted through a walkie talkie, "Mr. Watson, please come over! I have something to see you for. In this way, humanity had the first telephone and opened a brand new page of history.