The telescope is fixed on the horizontal axis in the transit theodolite instrument. And the line of sight can be reversed by turning it 180 degrees in a vertical plane.
In transit theodolite, an internal focusing telescope is used as the telescope. Currently, transit theodolites are commonly used for surveys.
In a non-transit theodolite instrument, the telescope cannot rotate the vertical plane completely on the horizontal axis. This type of theodolite can be carried in a vertical plane for some finite angles.
But this type of theodolite is not particularly used. Y theodolite and Everest theodolite are non-transport theodolite types.
Vernier is fitted to measure the angles in the theodolite. It is known as vernier type theodolite. This type of theodolite can measure angles up to at least 20".
This type of theodolite is fitted with a micrometer. By which the angles are measured. The micrometer is called theodolite because it is fitted with a micrometer. It can measure angles up to a minimum of 1".
Displays the horizontal and vertical angles in the display by the component of theodolite in digital form in electronic digital theodolite.
In electronic digital theodolite, angle readings are obtained in digital form with great precision. When E.D.M. If the instrument (measuring electronic distance) is connected to a computer, it is called a total station.
The horizontal axis in theodolite is known as the trunnion axis or transverse axis. The telescope can be rotated into a vertical plane on the horizontal axis.
It is an essential part of the Theodolite's line of sight. It is mounted on a horizontal axis.
In theodolite, the telescope is fixed internal focusing type or external focusing type as required. Internal focusing telescopes are commonly used in theodolite.
The telescope can be rotated on a horizontal axis in a vertical plane in theodolite. It can be measured by clamping the telescope in a vertical plane with a vertical clamp screw.
Vernier frames are commonly referred to as T-frames or index frames. It has two vernier fixes to read the vertical angles at both ends. The vertical arm enables the telescope to lock at the desired level.
The vertical circle is fixed in theodolite with a telescope to measure the vertical angles.
In theodolite, the vertical circle rotates with the telescope and measures the vertical angle of the determined locations. It is fixed on the horizontal axis.
It is fixed on the vertical circle with numbers from 0 ° to 360 માટે for making angular measurements. And some are fixed in the vertical circle of theodolite with numbers from 0 ° to 90°.
The altitude bubble in theodolite should be centered by its adjusting screw before reading the vertical angle.
The vertical circle is properly zeroed when the bubble is centered at the altitude of the theodolite. The angle read in this position will give the correct values.
The upper plate contains vernier numbers. So it is also known as the vernier plate. The upper plate supports the standard. It consists of a tangent screw and an upper clamping screw, which helps to position the lower plate.
In theodolite, the lower plate can be brought into position by the upper clamp screw and the corresponding tangent screw in the upper plate. Its lower plate can be modified by tightening the upper clamp screw in the upper plate.
The upper plate can be rotated for normal movement with the help of an upper tangent screw.
A straight line touches the centerline of the center bubble of the plate level tube, called the axis of the level tube. If the level tube is at the plate level, then it is called the plate level axis.
The lower plate is also known as the scale plate. Because it has 0 to 360 axes on a scale. It is attached to the outer spindle with fixing with a lower clamping screw. If the lower clamp screw is freed and the upper clamp screw is tightened, the two plates rotate together in theodolite.
Similarly, if the lower clamping screw is tightened and the upper clamp is freed, the upper plate may rotate. And the lower plate is fixed with a tribrach plate.
A circular compass box can be fixed in the center of the plate above the simple theodolites. . It will be useful when choosing a north as a meridian for a place.
The leveling head of theodolite consists of two parallel triangular plates, which is commonly called tribrach plate.
The upper plate is known as the upper tribrach plate, and the lower part is the lower tribrach plate. The leveling head has a three-foot screw, which is used to level the upper plate.
A tripod is a stand made of wood or iron. On which the theodolite clamp is fixed using a screw. The top surface of the tripod is fixed to the ground in such a way that it remains at the proper level. . There are steel shoes on the end of the tripod.
Typically theodolites, ranging in size from 8 cm to 12 cm, are widely used in survey work. Larger-sized theodolites are used for greater accuracy in triangular surveys.
For the Indian triangular survey, a theodolite of 91.4 cm (36) diameter was used.