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17. Complete the sentences with your own ideas. Use words from your vocabulary.

1. The hinged beam in this device ……………… .

2. Latitude determines ……………………………….. .

3. The astatizing mechanism …………………………… .

4. The pendulum …………………………………. .

5. The assumptions should be modified because ……… .

6. Discrepancies between two quantities ……………….. .

7. In our work we give preference to ……………… .

8. A helical spring is suspended from …………………… .

18. Replace the underlined words or word-combination with their synonyms from your active vocabulary. In some instances you have to change the structure of the sentence.

    1. The planetary correction occurs because of variations of gravity with latitude.

    2. The method making use of events reflected from the subsurface is commonly applied in petroleum exploration.

    3. Magnetic surveys are usually performed from the air or from a ship.

    4. Some devices utilizing the air are necessary to produce a source energy for seismic survey at sea.

    5. An anomaly can indicate a fault with one block which is moved up along the other.

    6. Different rocks produce local variations in Earth’s magnetic field and so give different readings from a magnetometer.

    7. A recording truck registers the data that are transmitted by receivers.

    8. The gravity method is based on the measurements of the variations in the pull of gravity of the rocks of different density.

19. Fill in the gaps with correct prepositions.

  1. The planetary correction is due ___ the variation ____ gravity ____ latitude.

  2. Pendulum methods have been superseded ___ gravimeter methods.

  3. Several corrections must be applied ___ relative gravity values.

  4. Detection of the beam depends ___ its azimuth.

  5. To shorten the observations time two beams are mounted side ___ side ___ antiparallel arrangements.

  6. Quantitative interpretation is usually ___ an indirect nature.

  7. Discrepancies _____ the two are reduced step ____ step.

20. Translate the following sentences into English.

1.Статические, гравиметрические методы заместили динамические методы маятника.

  1. Гравитационные методы особенно подходят для локализации структур в слоистых образованиях.

  2. Топографическая поправка высчитывается по подъему вдоль лучевых линий и концентрическим кругам вокруг станции.

  3. Количественная интерпретация имеет непрямую природу.

  4. Маятник определяет не только время, но и силу тяжести.

  5. Крутильный гравиметр измеряет гравитационные силы на единицу горизонтальной дистанции.

  1. State whether the following sentences are True or False; correct the false ones.

  1. Pendulum method in geophysics is used to measure time.

  2. “Coincidence” method is the least frequent method used among other pendulum methods.

  3. Static methods have superseded dynamic methods recently.

  4. Threlfall gravimeter is the one in which a vertical quartz rod is suspended in inverted position from a tout horizontal quartz fiber.

  5. Terrain correction is due to the variation of gravity with latitude.

  6. The gradients and curvature values may be resolved into their south and west components.

  7. Five azimuths are required to determine the five unknown quantities.

  8. The largest gradients occur on the edges of salt domes and igneous intrusions.

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