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VI. Fill in the blanks:

1. In today's theodolites, the reading out of … is usually done electronically.

2. The readout is done by … .

3. Lately CCD sensors have been added to the focal plane of the telescope allowing both … and … .

4. Integrated electro-optical distance measuring devices, allow the measurement in one go of … .

5. Self-registering tachometers or … , perform the necessary operations.

VII. Write down an annotation to the text using the following phrases:

The headline of the text I have read is …

The text is about …

According to the text …

The purpose of the text is to give some information about …

I think …

From my point of view …

This information is new (not new) for me.

I think I could use this information (in my practical work, in my studies, in my professional training).

I found the text useful (interesting, important, dull, too hard to understanding).

Communicative situation

1. Are you good at translating English text into Ukrainian? Read the article and prove it.

2. Work in groups and prepare a presentation of a modern gyrotheodolite.

3. Think over different situations:

a) at the scientific conference;

b) at the surveying service office;

c) at the instrument producing company etc.

Gyrotheodolites

The gyrotheodolite is a special type of theodolite used for surveys which do not

have sky visibility (mining, underground survey). This instrument gives the orientation of true north (the direction of Earth's rotational axis), which is set as a reference for future underground observations. The gyro-theodolite is composed of a theodolite with a gyroscope on it. True north is stored in the gyroscope for future use by orienting the theodolite approximately to the north (within a few minutes of arc); this minimizes losses when the directionality is later read. A power supply activates the rotation of the gyro spinner, which maintains orientation as the theodolite is transported.

To read, the theodolite is set at rest. The gyro will then oscillate through the north meridian until reaching the direction of true north; this is a point of minimum potential energy, similar to the bottom point of a pendulum. When the gyro has stabilized, the reading on the horizontal circle of the theodolite is equivalent to true north, and can therefore be used as a reference point.

Unit xviI

Global Positioning System (gps)

I. Learn the following words and word combinations:

distance meter - дальномір

infrared - інфрачервоний

pole - стійка, опора

to figure outвираховувати, калькулювати, проставляти розміри

utilizing – використовування

constellation - сукупність, група

receiverприймач, ресивер

Department of Defense - Міністерство Оборони

acronym1) абревіатура; 2) скорочення, умовне слово

aging - старіння; знос

shoot down - збити (літак)

earthquake - землетрус

II. Translate the following into English:

Первинна функція, сукупна станція, прилад для вимірювання відстані, вимірювання кутів, надсилати промінь, відбиватись від призми, вирахувати дійсне місце розташування, точне визначення місцезнаходження об’єкта, збирач даних, комп’ютерне програмне забезпечення, передавати мікрохвильові сигнали, цивільне використання, заміна застарілих супутників