Table of Contents
Which part of theodolite is used for accurate Levelling?
The leveling head- The leveling head consists of two parallel triangular plates called tribrach plates. The upper one is called as upper tribrach plate and is used to level the upper plate and telescope with the help of equalizing screws provided at its three ends.
Which instrument can be used for leveling survey?
The theodolite (q.v.), or transit, is used to measure horizontal and vertical angles; it may be used also for leveling.
What is Levelling in theodolite?
Levelling up of theodolite. The operation of making the vertical axis truly vertical is known as levelling of Theodolite. i) Turn the horizontal plate until the longitudinal axis of the plate level is. approximately parallel to a line joining any two levelling screws.
Can a theodolite measure distances?
A total station consists of a theodolite with a built-in distance meter (distancer), and so it can measure angles and distances at the same time.
Who uses theodolite?
The theodolite is an instrument that can measure both horizontal and vertical angles, which allows surveyors to “triangulate” the position of objects in a specific area. While the digital and transit theodolite have been used by land surveyors and engineers, they can be used for other purposes as well.
How accurate is a theodolite?
A number of investigators reported results of similar tests using theodolites, not levels. For distances less than 150 m, almost all investigators reported accuracy values in the range from 1/600 to 1/2100.
Can theodolite measure distance?
The theodolite consists of a telescope pivoted around horizontal and vertical axes so that it can measure both horizontal and vertical angles. In the most precise long-distance work, signaling lamps or heliographs reflecting the Sun are used as targets for the theodolite.
How a theodolite can be used as a dumpy level?
What is the difference between a theodolite and a dumpy level? In dumpy level we can check only horizontal angles whereas in theodolite we can check vertical angles also.
What is the operation of levelling of theodolite?
Levelling up of theodolite The operation of making the vertical axis truly vertical is known as levelling of Theodolite. i) Turn the horizontal plate until the longitudinal axis of the plate level is approximately parallel to a line joining any two levelling screws.
How do you adjust the tripod on a theodolite?
Adjust the tripod by moving each leg along the radius as well as the circumference, so as to bring the plumb bob exactly over the station mark and approximately level the instrument with the help of the built-in spirit leve l. While moving the legs ensure that the plate level should not be seriously affected.
Why are theodolites better than other reading instruments?
Theodolites have an internal optical device that makes reading circles much more accurate than other instruments. Also, because the theodolite allows you to take fewer repeat readings, these measurements can be made much more quickly. Theodolites with optical instruments have advantages over other layout tools.
What are the permanent adjustments for transit theodolite?
The permanent adjustment in case of transit theodolite are: Adjustment of the Horizontal Plate Levels. Adjustment of the Telescope Level or the Altitude level. Vertical Circle Index Adjustment.