- •1. Learn the following active words and use them in the sentences of your own
- •3. Look through the text and write out the English equivalents of the following words and word combinations. Use them in the sentences of your own.
- •5. Give short answers to the following questions:
- •7. Translate the following sentences:
- •1. Learn the following active words and use them in the sentences of your own.
- •2. Translate the following chains of words. Define what parts of speech they are
- •3. Look through the text and find the English equivalents to the following words and word combinations; use tem in the sentences of your own.
- •4. Translate the following sentences paying attention to the participle:
- •1. Learn the following active words and expressions. Use them in the sentences of your own.
- •4. Answer the following questions:
- •5. Work in pairs. Put questions to your partner and he (she) will answer them.
- •8. Translate the following sentences paying attention to the words need and turn:
- •9. Put all possible questions to the following sentences:
- •10. Define the following words according to the model given below.
- •13. Describe Fig. 2.
- •Exercises
- •Learn the following active words and use them in the sentences of your own:
- •2. Translate the following sentences, paying attention to the gerund:
- •7. Translate the following sentences paying attention to the words in bold type:
- •8. Put 5 questions to the text beginning with what.
- •9. Speak on the story told by the early Scandinavians.
- •10. Make an outline of the text.
- •1. Learn the following active words and use them in the sentences of your own.
- •2. Look through the text and find the English equivalents of the following words and word combinations:
- •5. Find the gerund in the text, define its function.
- •8. Translate the following sentences paying attention to both, both...And:
- •9. Fill in the blanks with prepositions:
- •10. Translate into Russian:
- •11. Form five sentences combining suitable parts of the sentence given in Columns I and II:
- •12. Describe Franklin's kite experiment.
- •13. Give a short summary of the text.
- •Exercises
- •1. Learn the following active words and Expressions
- •Look through the text and find the English equivalents of the following words and word combinations:
- •8. Make up a story of Franklin's kite experiment using the following sentences and sentences of your own (our sentences are given in a disorderly way):
- •11. Use the following expressions in sentences of your own:
- •13. Speak on magnetism.
- •15. Describe Figs 3 and 4.
- •Exercises
- •8. (A) For the names of the countries given in Column I find the names of the nations given in Column II:
- •10. Speak on:
- •11. Make an outline of the text.
- •12. Retell the text.
- •Exercises
- •1. Learn the following active words and use them in the sentences of your own:
- •2. Define the functions of the participle and the gerund in the text.
- •4. Answer the following questions:
- •5. Fill in the blanks with suitable words and word combinations given below:
- •6. (A) For the verbs in Column I find suitable nouns in Column II.
- •7. (A) Translate the following word combinations:
- •10. The following statements are not true to the fact. Correct them:
- •11. Make an outline of the text.
- •12. Retell the text.
- •1. Learn the following active words and use them in the sentences of your own:
- •2. Translate the following word chains into Russian, define what part of speech the words are.
- •4 Translate into Russian:
- •8. Form 10 sentences using the following words:
- •10. Translate the following sentences paying special attention to the words in bold type:
- •11. Retell the text.
- •12. (A) Fill in the blanks with prepositions, if necessary; (b) retell the text:
- •1. Learn Active Words and Expressions
- •2. Look through the text and find the English equivalents to the following words and word combinations. Use them in your own situations.
- •The Infinitive
- •2. Translate the following sentences paying attention to the infinitive
- •3. Translate the following sentences paying special attention to the words in bold type:
- •4. Translate the following sentences paying special attention to the infinitive:
- •5. Fill in the blanks with the words one or for:
- •6. Write out from the text all the sentences where the infinitive is used, and define its function. .
- •1. Active Words and Expressions
- •3. According to the models given below form sentences combining suitable parts of the sentence given in Columns I, II, III, IV,
- •5. Work in pairs, ask your fellow-students questions:
- •6. Explain why:
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •1 Learn the following active words and expressions and use them in the sentences of your own.
- •3. (A) Find the non-finite forms of the verb in the text; (b) define their functions.
- •4. Translate the following words and define what parts of speech they are:
- •5. Write out the adjectives with the suffix -able from the text. Translate them.
- •7. Answer the following questions:
- •9. Translate the following word combinations and use them in sentences of your own:
- •Exercises
- •2. (A) Give headings to each paragraph of the text; (b) explain why you have given such headings.
- •3. Translate the following sentences:
- •4. Define the non-finite forms of the verb met in the text.
- •5. Put 10 questions to the text.
- •6. Translate the following sentences:
- •7. Speak on:
- •Exercises
8. (A) For the names of the countries given in Column I find the names of the nations given in Column II:
1. 11.
America 1. The Italians
England 2. The Greeks
France 3. The Russians
Germany 4. The Englishmen
Greece 5. The Frenchmen
Italy 6. The Germans
Russia 7. The Americans
(b) What do you call the people, who live in:
Russia? England? Germany? France? America? Italy? Greece?
9. Translate the following sentences and define the non-finite forms of the verb:
1. The students went on studying properties of that new substance. 2. There are different ways of producing the electric current. 3. We heard of that experiment having been made last week. 4. We know of his starting some laboratory experiments. 5. Working at his new device, the inventor carried out an important research work. 6. An iron bar placed in the field of a magnet becomes magnetized. 7. A long time ago people noticed the attracting ability of the magnet. 8. The pole of the magnet pointing to the North is called the north pole of the magnet, the south pole pointing to the South. 9. The magnet having the north pole and the south pole, we can use it in the compass.
10. Speak on:
Three electrical phenomena' in the early history of electricity.
I use electricity every day.
11. Make an outline of the text.
12. Retell the text.
LESSON EIGHT
HISTORY OF THE THERMOMETERS
Placing a kettle full of cold water on the fire is quite an ordinary thing. This time we shall do it to carry out a simple experiment. Placing a finger into the kettle from time to time, we find, of course, that the water is gradually becoming hotter and hotter, until it boils at last. In scientific language we describe this phenomenon by saying that the temperature of the water is rising. Indeed, the boiling water has certainly a much higher temperature than that with which we started our test. However, we need some more exact means of measuring the difference of temperature than the use of our finger. In effect, the finger can give us neither exact information, nor numerical data.
As a matter of fact, the very first step in the development of heat engineering made it necessary to find a device for indicating temperature and for measuring its changes. As is well known, the thermometer is the very instrument that serves this purpose. The word comes from two Greek words, namely, "thermos" meaning "warm" and "measure" meaning "meter," that is, a measuring instrument.
As early as 1602, Galileo invented an air thermometer. It consisted of a glass bulb containing air and connected to a glass tube, the latter being immersed into a colored liquid. Being very sensitive to temperature changes, Galileo's air thermometer was not sensitive at all to changes of atmospheric pressure.
The type of thermometer familiar to everyone at present was first put into general use as early as 1654, or so. Making these first instruments was not an easy thing at all. Needless to say, the most difficult problem of all was that of marking the degrees on the thermometer, in other words, of graduating the scale. It was decided, at last, to take two fixed points
and to divide the interval between them into the same number of degrees. And then, in 1701, Isaak Newton, the famous English scientist, whose name is known all over the world, constructed a scale in which the freezing point of water was taken as zero and the temperature of the human body as 12°.
Some time later the German physicist Fahrenheit (1686-1736) proved that the temperature of boiling water was always the same at the same atmospheric pressure. It might therefore be used as a second fixed point instead of the temperature of the human body. As for the liquid used, it was mercury, which has been mostly employed since that time.
On the Fahrenheit scale the
boiling point of water is taken as
212° and the freezing point as
32°, the interval being divided
into 180 equal parts. The scale
Fig.
5. Comparing of the
Fahrenheit and Centigrade
temperature scales.
by writing the letter F after the temperature, as for example,
212°F. This scale is mainly used in English-speaking
countries.
So far we have not mentioned the Centigrade scale (Fig. 5). The latter was worked out by Celsius, a Swedish professor of astronomy. On the Centigrade scale the freezing point of water is marked 0° and the boiling point is marked 100°C, the letter С indicating this scale. This temperature scale is employed in the Soviet Union as well as in most other countries of the world.
Speaking of thermometers, one must make reference to the pyrometer. We know of its being used for measuring temperatures that are too high for mercury thermometers. We also know of its finding a wide application in industry.