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Task 3. Answer the questions, using the active vocabulary.
1. What is the Gyrotheodolite? Is it easy to use it?

2. Do all surveyors have access to Gyrotheodolites?
3. What is the application of gyrotheodolites?

4. What does a gyrotheodolite consist of?
5. What is the function of a 'meridian indicator'?
6. What is a floating gyroscope?

Task 4. Define whether the following statements are true or
false. Correct the false ones according to the text.

1. A hyro-theodolite is a surveying instrument composed of a

gyroscope mounted to a theodolite.
2. A hyro-theodolite is the additional instrument for orientation in

mine surveying and in tunnel engineering
3. The gyroscope enables the direction of true south to be

determined with a standard error of about ±15" within a very short
time.
4. The reading of gyroscope is a maximum when the gyro is

pointing north and a minimum when it is pointing east or west.
5. The theodolite is temporarly attached to the gyro assembly.

II. LEXICAL EXERCISES

Task 1. Complete the sentence according to the text.
1. __________is a particularly important part of site

establishment, installation and quality assurance.
2. ______of leveling are used in research on the figure of the

earth, variations in the levels of seas and oceans, and vertical
movements of the Earth’s crust.
3. Levelling is extremely important for __________, which
involves the measurement of three quantities: heights, angles and

distances.
4. __________can be measured using such instruments as: total
stations, handheld lasers and GPS devices.

5. For site work, ___________ can be chosen as a datum for
heights and for levelling.
6. ____________is chosen to avoid any negative heights
occurring.

7. ____________ is generally towards the centre of the earth.

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