What do you mean by 12 cm theodolite?

What do you mean by 12 cm theodolite?

A theodolite is designated by diameter of the graduated circle on the lower plate. The common sizes are 8cm to 12 cm while 14 cm to 25 cm instrument are used for triangulation work.

What is the range of a theodolite?

The Optical Theodolite

Is theodolite used to measure distance?

Theodolites measure horizontal and vertical angles only. Sometimes they are called tachymeters because we can calculate distances using geometric – trigonometric calculations by angular measurement through a graduated sight. A theodolite can be mechanical or electronic.

How is theodolite used to measure?

Great right I’ll lead you to it then now we’re going to measure a horizontal. And a vertical angle. We’ve got two pegs set up in the ground I’m going to sight the instrument to the first peg.

What is 8 cm theodolite?

The size of Theodolites is defined according to the diameter of its main scale, such as a 10 cm theodolite means that the diameter of its main scale is 10cm. In a survey, 8 cm to 12 cm theodolites is generally used.

What is a vernier theodolite?

The vernier theodolite is also known as a transit. In a transit theodolite or simply transit the telescope can be rotated in a vertical plane. Earlier versions of theodolites were of the non-transit type and are obsolete now. Only the transit theodolite will be discussed here.

What is the accuracy of a theodolite?

The accuracy in modern first-order or geodetic instruments, with five-inch glass circles, is approximately one second of arc, or 1/3,600 of a degree. With such an instrument a sideways movement of the target of one centimetre can be detected at a distance of two kilometres.

How do you test theodolite level?

Measure the height between the ground and the instrument. This will be used a reference to other stations. Level the theodolite by adjusting the tripod legs and using the bulls-eye level. You can make slight tunings with the leveling knobs to get it just right.

What is the range of total station?

A typical total station can measure distances up to 1,500 meters (4,900 ft) with an accuracy of about 1.5 millimeters (0.059 in) ± 2 parts per million. Reflectorless total stations can measure distances to any object that is reasonably light in color, up to a few hundred meters.

Why do we use theodolite?

The theodolite is essentially the most accurate instrument to measure the horizontal and vertical angles to work this out. But they can also be used for locating points on a line, prolonging survey lines and finding differences in elevation.

How do you read a theodolite scale?

Study the outer scale. The top number tells you what the angle is to the right. If you were to draw an arc to the right from the theodolite to the object being surveyed the top number would give you the angle measure of that arc. The complementary arc to the left is read using the bottom number.

What is 10 cm theodolite?

What is a Vernier theodolite?

What are the 2 types of theodolite?

Types of Theodolites

There are two different kinds of theodolites: digital and non digital. Non digital theodolites are rarely used anymore. Digital theodolites consist of a telescope that is mounted on a base, as well as an electronic readout screen that is used to display horizontal and vertical angles.

What is the principle of theodolite?

How Does a Theodolite Work? A theodolite works by combining optical plummets (or plumb bobs), a spirit (bubble level), and graduated circles to find vertical and horizontal angles in surveying. An optical plummet ensures the theodolite is placed as close to exactly vertical above the survey point.

Why is theodolite used?

theodolite, basic surveying instrument of unknown origin but going back to the 16th-century English mathematician Leonard Digges; it is used to measure horizontal and vertical angles. In its modern form it consists of a telescope mounted to swivel both horizontally and vertically.

What are the 4 types of total stations?

As per Trimble Geospatial, there are the following four types of Total Stations;

• Scanning Total Stations.
• Robotic Total Stations.
• Autolock Total Stations.
• Total Mechanical Stations.

Which is the best total station?

Check Out the best Total Stations

• Leica iCON CC80 Tablet Computer.
• Leica iCON iCT30 Construction Layout Tool.
• ICON iCR80 Robotic Construction Total Station.
• Leica Geosystems iCON iCB70 Manual Construction Total Station.
• ICON iCR70 Construction Robotic Total Station.
• Leica iCON iCB50 Manual Construction Total Station.

What type of theodolite is?

This classification of theodolite contains four types of theodolite which are discussed below.

• Repeating Theodolite.
• Directional Theodolite.
• Electrical Digital Theodolite.
• Total Station.
• Primary Theodolite.
• Electronic Digital Theodolite.

How is theodolite set?

How to Use a Theodolite

1. Mark the point at which the theodolite will be set up with a surveyor’s nail or a stake.
2. Set up the tripod.
3. Drive the tripod legs into the ground using the brackets on the sides of each leg.
4. Mount the theodolite by placing it atop the tripod, and screw it in place with the mounting knob.

Why vernier scale is used in theodolite?

The theodolite employs a Vernier scale, which, with a little practice, can accurately measure angles to the minute. Learn angle basics. Before you can understand the Vernier scale on a theodolite, you must know how angles are broken up. A full circle consists of 360 degrees.

What is the size of theodolite?

The size of the theodolite varies from 8-25 cm. 2. The process of establishing intermediate points, on a given straight line whose ends are intervisible is done with a theodolite is called lining in.

Where is theodolite used?

Theodolites are used mainly for surveying applications, and have been adapted for specialized purposes in fields like metrology and rocket launch technology. A modern theodolite consists of a movable telescope mounted within two perpendicular axes the horizontal or trunnion axis, and the vertical axis.

What is Range of total station?

What is dumpy level in surveying?

What is Dumpy Level? Dumpy level is commonly used leveling instrument to locate the points in same horizontal plane. It is also called as automatic level or builder’s level. Elevations of different points and distance between the points of same elevation can be determined by dumpy level.