1. You may use this instrument in your experiments.
2. Man made satellites had to use solar cells as a source of power.
3.They should test the new equipment before starting to work.
4. In the modern world radio communications must play an important role.
5. Laser can be used in different branches of industry.
IV. 1 6 . 3,4 5- .
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to graduate from-
to prove-
transmitting signals
invention-
A GREAT INVENTION OF RUSSIAN SCIENTIST
1. Radio occupies one of the leading places among the greatest achievements of modern engineering. It was invented by professor Popov, the talented Russian scientist, who demonstrated the first radio receiving set in the world on May 7, 1895.On this day we mark the anniversary of the birth of the radio.
2. A.S. Popov was born in the Urals on March 16, 1859.For some years he had been studying at the seminary in Perm and then went to the University of St. Petersburg. In his students days he worked as a mechanic at one of the first electric power plants in St Petersburg, which was producing electric lights for Nevsky prospect.
3. After graduating from the University in 1882, A.S.Popov remained there as a post graduate at the physics department. A year later he became a lecturer in Physics and Electrical Engineering in Kronstadt. By this time he had already won recognition among specialists as an authority in this field.
4. After Hertz had published his experiments proving the existence of electromagnetic waves, A.S Popov thought of a possibility of using Hertz waves for transmitting signals over a distance. Thus the first wireless receiving set was created. Then Popov developed his device and on March 24, 1896 he demonstrated the transmission and reception of a radiogram consisting of two words: Heinrich Hertz. On that day the radio telegraphy was converted from an abstract theoretical problem into a real fact.
5. A.S. Popov did not live to see the great progress of his invention. In its first decree the Soviet Government planned the development of an industry for producing radio equipment, the construction of radio stations.
6. The 533-metre ferroconcrete TV tower at Ostankino, in the northern section of Moscow, is one of the worlds tallest free-standing structures. Moscow television centre is situated in Ostankino. It houses the broadcasting and TV stations, the apparatus and communication systems, the equipments of the Central High-Altitude Hydrometeorological Observatory. Television now plays an important part in many peoples lives. Television informs people about current events, the latest developments in science and politics.
V. 2- . .
Where did Popov work in his students days?
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1. He worked at the gymnasium.
2. He worked at the first electric power plant.
3. He worked at the Post Office.
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I. ; - - . . () .
) 1. Konstantin Tsiolkovsky made his own laboratory equipment.
2. Earth sputnik will represent a very small mass free from the pull of
gravitation, he wrote.
3. He has spent some years on his experiments, so the results may be trusted.
) 1. Tests on stresses on the human body are still carried today.
2. A new spaceship will be launched next month.
II. ; Participle I Participle II , .. , , -. .
1. His books are widely read today by specialists in this field.
2. The machine parts lie on a moving platform.
3. Repeating his experiments he noticed an interesting regularity.
4. The first object observed by Galileo through the telescope was the moon.
5. When they were looking into the night sky they suddenly saw a falling star.
