You can learn from history and read about geography and history of the world. The history of Rome, Europe, America, Asia.
How to set up a telephone cable across the ocean? | Inventions
How to set up a telephone cable across the ocean? If you pass through your head when youre done talking on the phone, what is needed to be witnesses of your conversation? Today, just lift the phone and after a few moments chatting with someone in another part of the continent
If you pass through your head when youre done talking on the phone, what is needed to be witnesses of your conversation? Today, just lift the phone and after a few moments chatting with someone in another part of the continent. Or submit a telegram to a nearby post office, and for very short time, one to whom you sent a telegram to the other end of the world can read your message! It would be impossible, there are no cables laid on the ocean floor, which connects all continents. | The first problem that occurred prior to installation cables along the ocean floor was to insulate the wires. After many experiments, it was found that various materials, if they do around the cable, failing to isolate the wire, thus ensuring the flow of electricity. People then started to install cables which are connected various points on the Earth balls. During 1841st and 1842. the telegraph cable was laid under the New York harbor, and the 1850th year Lamanehe got his first underwater cable. After England and France, the cable are connected with Ireland and Scotland, Sweden and Denmark, Italy and Corsica. Finally, the 1857th year, an American scholar and an English Field, Lord Kelvin, tried to submarine channel across the Atlantic to connect Newfoundland and Ireland. It was a tremendous undertaking. After much effort and many disappointments, he finally achieved success. United States and British government provided the two warships to the plan to materialize. Each half of the ship boarded the cable. cable is connected to the middle of the ocean and then odmotavan, while the ships in fact turned in two opposite directions, the two opposite shores of the ocean. In installation, the cable broke several times. Finally, the 13 August 1858. first message crossed the ocean. But the cable worked only two months and then burnt. electric current was too strong for cable insulation. Only 1865th there was a new try replacing the cable. Then Lord Kelvin had already found a telegraphic apparatus which did not require such a large supply. Great Eastern, which at that time was the largest ship in the world was equipped for laying cables. first cable snapped at about the two thirds of the length of Ireland. in 1866. laid a cable that has virtually come to a newfound Landa. Then he found the end of the lost cable, so it is connected with other parts of this cable, so that at the time of the two cables simultaneously performed job. Thus a new era in the communication system. Today longest cable connects British Columbia and is a long about 13,000 kilometers. It is divided into sections, with stations on the islands.