Презентация по английскому
.docxThe connecting between people was a great scientifically interest, because the pigeon's mail had really big losses.
1789 – He offered the French government to install the system of the signal towers on the all country’s area.
On the tower there were plates, different combinations of the signals meant different words and word’s combinations.
The telegrapher on the other tower took the signals and passed them to the next.
This way of the communication had any difficulties, specially during bad weather conditions.
Militaries were not satisfied and required the invention, that would be more fast and were independent of the weather.
On the 15th of the February 1870 the electrical telephone has been invented by Alexander Bell.
This invention didn’t pass words, but short or long signals only.
1875 – Alexander Bell has invented the electrical device, that passed the sounds of the speech.
It was the scientifically progress!!!
1886 – the Swedish telephone apparatus.
Mobile phones have become an important part of our everyday lives, and we can not imagine the life without them!!!
1946 – the first mobile phone was developed for the cars. Of course, the communication and the link were established with the help of radio waves. Despite the fact that the phone was a big-sized, bulky, weighed about 3 kg and was extremely uncomfortable to use.
1967 – Martin Kuper (engineer of the company Motorola ) invented the portable phones for the policemen.
His weight was 1150 g, length - 22,5 cm, width - 3,75 cm, Height - 12,5 cm the communication with such a phone could be a little more than an hour, after them the apparatus required 10-hour battery life. Nevertheless, the appearance of this device is meant a new era when anyone can get a connection, wherever he is located!!