Theodolite

Question 1

What is the purpose of a Theodolite?

Answer 1

To provide an artificial horizon and vertical index for checking levels and verticals.

Question 2

Where would theodolite be positioned for a three guyed mast?

Answer 2

Direct one Theodolite inline with one guy but opposite to its position, direct a second Theodolite at 90degress to first Theodolite.

Question 3

Where would a theodolite be positioned for a four guyed mast?

Answer 3

Direct one Theodolite inline with one guy, direct a second Theodolite at a guy 90degress to first Theodolite.

Question 4

Name three precautions to take when working with theodolites?

Answer 4

• Do not submerge instrument in water or any other chemical.
• Do not drop instrument.
• Make sure theodolite is locked in its case while transporting.
• When raining, use cover over instrument.
• Do not look directly into the sunlight through the telescope on the instrument.
• Using a wooden tripod can protect the instrument from vibrations better than an aluminium tripod would.
• Using the sunshade attachment is important; any sudden temperature changes can cause incorrect readings.
• Never hold the instrument by the telescope.
• Always have a substantial level of battery power on your instrument.
• Always clean the instrument after using.
• Dust in the case or on the instrument can cause damage.
• If the theodolite is damp or wet, allow it time to dry out before storing it in its case.
• When storing, make sure that the telescope on the instrument is in the vertical position.
• When the theodolite is being re-levelled, the position over the ground point must be checked and rechecked to ensure the same position.
• When the theodolite is being repositioned over a ground point, the level must be checked and rechecked to ensure its accuracy.

Question 5

What must accompany the theodolite when it is required to undergo calibration?

Answer 5

The tripod