How did the earliest people get through the phone?

The original telephone (terminal) was a magnet telephone composed of a micro-generator and a battery. When making a phone call, the user uses the hand-cranked micro-generator to send an electric signal to call the other party, and the other party connects the phone to form a call loop. Later 1877, T.E. Edison invented the carbon microphone and induction wire, which extended the communication distance. That same year, the telephone was invented. 189 1 year, finally developed into a.b. strowger who invented the automatic telephone.

The telephone was invented by American A.G. Bell in 1876. He used two wires to connect two transmitters and receivers with the same structure and a diaphragm on the electromagnet, which realized the communication between the two ends for the first time. But the call distance is short and the efficiency is low. Carbon microphone appeared in 1878, which greatly improved the efficiency of telephone microphone. The receiver structure has also been improved. The earliest telephone was a magnet telephone, which was powered by its own battery and sent a call signal with a hand-cranked generator. 1880 * * electric telephone appeared, which was powered by * * * electric switch in a centralized way, saving the hand-broadcast generator and dry battery. 189 1 year, rotary dial-up automatic telephone appeared, which can send out DC dial-up pulse, control the action of automatic exchange, select the called user and automatically complete the transfer function. Thus pushing telephone communication to a new stage. By the end of 1960s, push-button all-electronic telephone appeared. In addition to pulse signaling, DTMF signaling also appeared. With the development of program-controlled switches, dual-tone telephone is becoming more and more popular. Electronic telephone circuits are developing towards integration, and telephone application specific integrated circuits have been widely used in various components of telephone circuits. Various multifunctional telephones and special telephones have also emerged. By the early 1990s, there had been a telephone which integrated the functions of dialing, talking and ringing on an integrated circuit. With the development of speech recognition technology, a new type of telephone that dials directly by voice is also emerging.