The term “internal combustion piston engine” referS to engines in which air and gasoline are buRNT inside the metal cylinders and which drive rotating crankshaft by means of piston and connecting rods. Since a great deal of heat IS produced when the gasoline mixture burns or explodes, some means must be provided to CARRY away the excessive heat. According to the cooling system employed the piston engines may BE CLASSIFIED as air-cooled engines and liquid-cooled ones.
Almost everyone I know looks forward for summer holidays. It’s the longest period of time during the year when people can do whatever they like. Some of them prefer to spend time away from the city in their country houses. Others choose to spend most of their summer at the seaside or travelling. Any of these holiday plans are suitable for me. Nearly every summer I spend a week or two at the seaside and about a month at my grandparents’ place. This summer was no different. After the term exams I went to the Black Sea shore with my parents and one family we are friends with. We had a great time there. I love swimming more than any other activity. Even in winter I visit our local swimming-pool and it gives me so much pleasure to spend an hour swimming. This summer at last I’ve learned some basics of wind-surfing. Other than that we rode on a yacht that my father rented. It was a fantastic adventure. When we returned my parents drove me to the grandparents’ country house, where I stayed for the rest of the month. My dad had some work to do in the city, so they couldn’t stay. Time passed quickly there. Nearly every day I went to the local lake with my country friends to swim and sunbathe. At the end of my stay my skin was so brown that my parents hardly recognized me. After all it was a great and memorable holiday. I wish summer was all year round and perhaps I’m not the only one.
Dear "English Bridge",
I'd like to tell about the invention of telephone. It was invented by Alexander Bell in 1875. Alexander Bell was born in Edinburgh, Scotland. When his family went to America, he was given a teaching position with deaf people and he became interested in speech. His work was financed by the father of one of his pupils. The story goes that Bell invented the telephone by accident. At the time he was experimenting with the telegraph. He spilled some acid and called his assistant. "Come here, Mr Watson, I want to see you" Watson was in the other room and he heard Bell through apparatus. The first telephone exchange which connected 21 people was opened 1878. The first communication satellite was launched in 1962
With best regards
<span>Peter
Hi, everybody!
I think that one of the most important inventions for the mankind of the first accurate clock which was designed by Christian Huygens in 1657. Christian Huygens was born in the Hague, Holland.<span>Mechanical clocks were made in the 14th century but they were too inaccurate to have minute hands.
Shadow clocks or sundials are the oldest instrument for telling the time. They were developed more than 4000 years ago. Water clocks were used in ancient Egypt. Time was measured by how long it took water to flow out of holes in a container. Sand clocks werw used in the Middle Ages. If they took an hour to empty they were called hourglasses. Today they are still often used as kitchen egg-timers. Pocket watches were invented in about 1500 and wristwatches started to get popular around 1900 when they were made mainly in France and Switzerland.
With my best wishes
<span>Julia</span>
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Go/feeds/is watching
3.I usually stay at home on Sundays.
My sister likes tidying her room
I like playing tennis at the weekend.
4. Worked, stayed, looked, sat, came, brought, bought, fed