How old was the phone?

From telegraph to telephone

Alexander Graham Bell succeeded in inventing the telephone after his attempts to develop the telegraph. The telegraph was a means of communication thirty years before the invention of the telephone. Despite its successful system, it was limited to sending and receiving one message at a time. Bell then worked on the possibility of transmitting multiple messages at the same time and via The same wire, and in March of the year 1875 AD, Bell met with Joseph Henry, director of the Smithsonian Institution, where Joseph listened to his ideas about the telephone and encouraged him to work on it. After the development of the telegraph in June 1875 AD, he discovered - accidentally - that sound could be transmitted through wires, and then Thomas began Watson and Bell worked on the invention of the telephone. The first telephone call between them took place when Bell spoke to Watson on the telephone, saying: “Mr. Watson, will you come here? I want to see you.” Watson then announced that he had heard him, and in March 1876, Bell obtained a patent. An invention of his device, which quickly began to spread.

The first phone

The first regular telephone was manufactured in New Haven in 1878 AD. Telephones were rented in pairs to subscribers, as the subscriber had to prepare his own line to be able to communicate with the other subscriber. In 1889 AD, Stroger invented an adapter that could connect one line to any line from a group of lines. Up to a hundred.

Cordless phone

Cordless phones are phones that allow them to be used freely within a limited distance of up to 100 metres. The first devices used an analog signals system that operates on a pair of frequencies (1.7 and 49 MHz). At the beginning of the eighties, cordless phones operated on frequencies within the two bands (46 and 49 MHz). In the late 902s, they began to operate within the bands (928 and XNUMX MHz), and these phones also use analogue, digital, or spread spectrum signal technology.

mobile

Motorola is the first foreign company to manufacture mobile phones in the world. The first phone call was made through it in the early seventies. Motorola was then followed by many other manufacturers, such as: Sony Ericsson, LG, Panasonic, and others. The camera was also recognized as part of From the mobile phone in 1997 AD by Philip Khan, and in 2007 AD 85% of mobile phones manufactured contained a camera.

The main parts of a landline telephone

The main parts of the phone are as follows:

• Transmitter: The transmitter contains a metal disc called a “telephone drum” or a diaphragm. When a person speaks on the phone, sound waves reach the telephone drum and cause it to vibrate. When it vibrates, it presses on the carbon grains located behind the drum. An electric current is passed along the wires of the person being spoken to, and it is indicated that the loudness of the sound causes the drum to vibrate faster, which leads to greater pressure on the carbon grains, then increasing the flow of electrical current.
• Receiver: The receiver contains a metal disc, also called a drum, and it vibrates as a result of its contact with two magnets. One of them is an ordinary magnet that helps hold the drum in place. The second magnet is the electromagnet, which is a piece of iron around which a conductive wire is wrapped. When an electric current is passed through A coil of wire, this piece of iron becomes a magnet, and the receiving drum of a telephone acts as a transmitter, allowing the person speaking to hear the other person's conversation.