Вопрос № 223854 - Английский язык

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Hanna and Heather Craig, twin sisters aged seventeen from Alaska, have invented a new winter rescue device: a 1.2 metre-long robot called the Ice Crawler. The robot is designed to take a rope to a person in a dangerous situation, for example, on thin ice or very soft snow.
The robot runs on two 12-volt drive motors – one on each of the tracks. These are powered by a 12-volt battery. A plastic tube carries the control panel’s wiring. It also holds the rope that pulls the victim back to safety. A video camera is attached to the front of the robot. This helps the rescue team to see where the Ice Crawler is going in snowy conditions or on very rough ground.

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Locomotives on some railroads are known to be equipped with apparatus located in the cab, which gives a continuous indication to the engineman identical with that shown by wayside signals.

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Since the Stone Age, man has found many more materials that he can work with to his advantage. His ingenuity has led him to discover the potential of many natural products. However, the materials that helped him most to develop were the metals.

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However, the materials that helped him most to develop were the metals. Their characteristics of the strength coupled with the ease with which they can be shaped made metals of vital importance in the technology of the past. The exploitation of other properties, such as electrical and thermal conductivity, made it possible to develop high technologies appropriate to the fields of space travel, communications and nuclear engineering.

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The first materials which man discovered were copper and gold, because they occur naturally in the pure state. They were used because they could be shaped easily, gold being especially soft. The discovery that copper could be obtained in sufficient quantities for beating into vessels and weapons was an important step in the use of metals, but the discovery that copper ore would produce copper was probably accidental.

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Copper had been smelted and used for two thousand years before the potential of iron become evident. In the course of smelting activities, no doubt iron ores and the substance resulting from smelting them were encountered.