3. Answer the following questions:

4. 1) Where is the main radar equipment mounted?

2. Why is the Sal Log used?

3. Where is PRP situated?

4. Translate the following text for additional reading:

Magnetism found its practical use in the compass. Many centures agо the people of ancient China noticed the attracting properties of loadstones . The property helped them to discover that a freely suspended magnetized bar points North and South, so it can be used to determine direction. Thus the compass was invented.

At the end of the eleventh century the Chinese began to use the compass in navigation, when they discovered how to make magnetic needles. Those iron, fish-shaped needles floated on water, and they were acted on by the earth's magnetic field.

In the twelfth century the compass of the floating needle type came into use. Its iron needle was fastened to a thin strip of cork or wood, so that it floated in a bowl of water. The needle was magnetized by contact with a natural magnet taken from the earth. This compass was in use on Chinese ships up to the seventeenth century.

In Middle Ages there were trade contacts and busy cultural exchanges between China and Arab countries. So the Arabs were the first to learn how to make compasses and to use them in navigation. The Arabs then introduce the compass in Europe. We know that the compass was also used in Italian, Portuguese and Norwegian ships of the twelfth century.

The great invention of the ancient Chinese was further developed thanks to the skilled Arab and European scientists.

Notes:

• load stone — природный магнит, магнитный железняк

Библиографический список

1.Протопопова М.И. Сборник текстов и упражнений по ТСН / М.И. Протопопова. - С.Петербург.; ВВМУ им.Фрунзе,1999. - С.3-34.

2.Navigation for Mariners and Aviators by Captain David Polowe / D.Polowe. - New-York, 2000. – 20 с.

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