## What is theodolite used for?

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 is land surveying 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 many types do theodolite classified?

Explanation: Theodolites are classified into two types. They are transit theodolites and non – transit theodolites.

What is theodolite and its parts?

Theodolite consists of some main parts, such as: Telescope. Horizontal plate (Circle) Vertical Circle. Index frame.

Who discovered theodolite?

Leonard Digges
The theodolite was invented in the sixteenth century. Its precise origin is unclear, but one version was invented by English mathematician Leonard Digges in 1571, who gave it its name. A great theodolite was invented by Jesse Ramsden more than 200 years later in 1787.

## What are the fundamental lines of theodolite?

what is the fundamental line of the theodolite

• The verticle axis.
• The axis of the plate level. ( The plate level)
• The line of collimation.
• The horizontal axis (Turnion axis)
• The axis of the altitude level. ( The bubble line of altitude level)

### 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.

#### What is the principle of theodolite?

Which theodolite are commonly used?

Vernier type theodolites are commonly used . 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.

Which country invented theodolite?

The theodolite was invented in the sixteenth century. Its precise origin is unclear, but one version was invented by English mathematician Leonard Digges in 1571, who gave it its name. A great theodolite was invented by Jesse Ramsden more than 200 years later in 1787.

## What are the main parts of theodolite?

Theodolite Parts and Functions: Leveling Head: (i) It provides a bearing for the outer hollow spindle. Limb or Lower Plate: The outer axis is attached to the lower plate which consists of a horizontal circle, usually whole circle division, i.e., with whole circle graduation: from Spindles: There are two spindles or axes or centers one inside the other.

### What does a theodolite do?

A theodolite is a device for measuring horizontal and vertical angles. The traditional theodolite consists of a sighting instrument that can be rotated horizontally and vertically, and two calibrated circular plates, positioned so as to measure the amount of horizontal or vertical rotation in degrees.

#### How does 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.

What is the Index error in theodolite?

The modern digital theodolites have electronic displays. Errors in measurement Index error The angles in the vertical axis should read 90° (100 grad) when the sight axis is horizontal, or 270° (300 grad) when the instrument is transited. Half of the difference between the two positions is called the index error.