Theodolite Traversing

Theodolite: It is an instrument used to measure the horizontal and vertical angles. It is also known as Universal Instrument.

To measure vertical angle (VA).

To measure the bearing of line.

• To measure the horizontal distance between two points (tachometry surveying).

To measure the vertical heights of the objects (trigonometric levelling)

Ranging a line.

To measure the slope of a natural ground.

Types of Theodolite

According to the telescope.

i.   transit Theodolite

Telescope can be completely revolved in a horizontal or vertical plane.

ii.   Non-transit Theodolite

Telescope can only be completely revolved in a horizontal plane, but it can be revolved to a certain/small extent in vertical plane (i.e., 0° to 45°).

According to the display of readings.

i. Optical Theodolite

• Non-transit
• Old type

ii. Vernier Theodolite

• Transit

iii. Electronic Theodolite (Digital Theodolite).
• Transit
• Digital display on screen.