Transit Vernier Theodolite

Transit Vernier Theodolite

---

This is defined by the diameter of the graduated circle of the lower plate. Common sizes are 8 cm to 12 cm while 14 cm to 25 cm are used for triangulation work or you can say for more precise works.

Main parts of a transit vernier Theodolite are: –
Leveling head
lower circular plate
Upper plate
Telescope
Vertical circle

There are some fundamental lines of Transit Theodolite:
Vertical axis
Horizontal axis or Trunion axis
Axis of the altitude bubble or Azimuthally axis
Line of collimation
Axis of the plate bubble
Axis of striding level if present.

Features:-
Trivet
Tribrach
Foot screw
Inner axis
Outer axis
Vernier plate
Circle plate
A-frame
Vertical circle clamp arm
Vernier frame
Vertical circle
Altitude bubble
Vertical circle clamp
Telescope
Plate bubble
Upper clamp
Lower clamp
Tripod head

Technical Specification:-
Magnification and resolution of the telescope
Least count of the vernier and sensitivity of the plate and telescope bubbles
Average length of sight of 300 assumed in deign
Magnification 18 to 28 xs
Field of view -1degree to 1 degree30′
Minimum focus -5′ to 7′
Outer cover
Outer axis
Inner axis
lower clamp
Tangent screw
Spring box
Clam and tangent screw
Vertical circle graduations
X- Hairs usually are + with stadia lines above and below
The transit is a repeating instrument because angles are measured by repetition and the total is added on the plate
1 Better accuracy obtained through averaging
Disclosure of errors by comparing values of the single and multiple readings

Accessories:-
Plate level
Index frame
Plumb bob
Tripod
Clamps and tangent screws
Staff rod
Tripod