25. The three types of hydrogen atoms (isotopes) were found to have exactiy the same characteristics, tlie only difference between them being with respect to mass.

B. Словосочетания со словами as и so:

as long as, as far as, as soon as, as to, as If, as well as, as well, as a wtiole, as for, so tfiat, so far, so on, so far as (smtfi.) Is concerned

26. Once converted into a liquid, oxygen will remain in its liquid state as long as the temperature is maintained at or below -297° F.

27. The importance of reducing the weight and bulk* of aircraft equipment as far as possible is generally appreciated.

28. As soon as the piston meets the liquid, the liquid pressure can be raised to the required value.

29. Much uncertainty exists as to the precise physical properties of meteoroids.

30. In effect, each particle of iron (or any other material that can be magnetized) behaves as if it had a north pole and a south pole.

31. When electric charges are in motion, they are surrounded by magnetic fields as well as by electric fields.

32. For most metals ultra-violet light is necessary for electron emission to occur, but very active metals, such as potassium and cesium, respond to visible light as well.

33. The atom as a whole is electrically neutral.

34. In liquids a rise in temperature means an increase in average speed of translational motion; in solids a rise in temperature means an increase in vibrational motion. As for gases, we further assume that liquid and solid particles can take up energy in other ways, so that absorption of 1 cal. of heat by 1 g. of different materials may produce different increases in temperature.

35. So far we have treated the Earth as spherically symmetrical, but this is not the case.

36. If an object can reflect red light but absorbs other colors, it will appear red in sunlight; if it reflects chiefly green light, it will appear green in sunlight, and so on.

37. So far as space-flight is concerned, we have already seen that there is no alternative at present to some form of rocket motor.

Словообразовательное упражнение

13. Переведите следующие глаголы с префиксом out-, который придает глаголу значение «превзойти* (кого-л., в чём-л.):

outperform, outweigh, outnumber, outgrow, outmaneuvre

* bulk -объем

Упражнение на перевод терминов

14. Переведите сложные термины, в состав которых входят прилагательные high и long.

Упражнение в чтении 15. Прочитайте следующие слова из основного текста:

haphazard Ihaephaezad] superiority Isjui.piarionti] acoustics [ai<u:stii<s] innumerable [inju:marabl]

endeavour [indeva] contribute flontnbjuit] interpret [mta:prit] mysteries [mistanz] subtle [sAtlJ

ДОПОЛНИТЕЛЬНЫЕ ТЕКСТЫ ДЛЯ ПЕРЕВОДА

1. EXPERIMENTAL RESULTS WITH A COLLINEAR ELECTRODE PLASMA ACCELERATOR AND A COMPARISON WITH ION ACCELERATORS

(Для перевода без словаря)

Several ways have been suggested for the electromagnetic acceleration of ionized material for propulsive purposes. Two ways which seem most promising at present and are receiving the most attention are ion drive * and plasma drive. Because these devices differ in some important aspects and because of the still limited amount of critica experimental data, it is difficult to conclude with certainty which type of device will ultimately prove to be superior. It is not unlikely that each type will be useful for some particular application.

In an ion drive device, positive ions, quite likely produced by surface ionization, are acce erated by static electric fields. Electrons or negative ions must be added to the accelerated positive ion beam to provide overall charge neutrality and maintain proper functioning of the accelerator.

Ion-propelled spaceship on round trip to Mars.

In a plasma drive device, neutral plasma is accelerated by rapidly varying magnetic fields. These fields may result from large currents developed in a plasma discharge by externally applied voltages. The plasma itself can be produced by the action of the discharge.

Ion accelerators are simpler than plasma accelerators, and considerable experience with ion and electron guns exists. Pos-