When lower clamp and lower tangent screw is used in theodolite?

Answer: Lower plate screw and upper plate screw is used for measuring only horizontal angle. If we discuss about Transit vernier Theodolite then we can see two screw i.e. lower plate screw and upper plate screw. Theodolite is used for measuring horizontal and vertical angle.

What is the use of tangent screw in theodolite?

A very fine, slow-motion screw giving a tangential movement for making the final setting to a precision surveying instrument (such as for completing the alignment of sight on a theodolite or transit by gentle rotation of the reading circle about its axis).

When upper clamp and upper tangent screws are used?

When clamped, the instrument can be gradually transited around the circle by use of the upper horizontal tangent screw. It is the upper clamp and tangent screw which are used during a sequence or “round” of horizontal angle measurements.

What are the functions of clamp screw and tangent screw?

The clamp and tangent screws are provided to clamp the upper plate with lower plate. If both the plates are clamp then the lower Clamp is loosened, the instrument may be rotated about the outer axis while if the lower plate is clamped and the upper one is loosened, the instrument can be rotated about the inner axis.

When vertical clamp and vertical tangent screw is used in theodolite?

Where is theodolite used?

A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are used mainly for surveying applications, and have been adapted for specialized purposes in fields like metrology and rocket launch technology.

When vertical clamp and Vertical tangent screw is used in theodolite?

What happens when lower clamp is locked and upper clamp is loose?

If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated.

When upper clamp is and lower clamp is the readings on Vernier does not change?

When the upper plate clamp screw is tightened and the lower plate clamp screw is opened, the instrument rotates on its outer axis, There is no relative motion between the two plate and the readings in the horizontal vernier scales do not change.

Which clamp in theodolite is used for clamping upper and lower plate?

The clamp screw attached with the upper plate of a theodolite is called upper plate clamp screw. When it is tightened, the inner spindle gets fixed with the outer spindle and, thus, the upper plate gets fixed in position.

Which type of screw is used for Levelling of theodolite?

Two verniers are screwed to the upper plats. It carries an upper clamp screw and tangent screw. On clamping the upper clamp and unclamping the lower clamp, the instrument may be rotated on its outer spindle without any relative motion between the two plates.

What are uses of theodolite?

The theodolite is most accurate instrument used mainly for measuring horizontal and vertical angles. It can also be used for locating points on a line, prolonging survey lines, finding difference in elevations, setting out grades, ranging curves etc. ADVERTISEMENTS: (2) Non transit.

How to use the clamp and tangent screws?

The clamp and tangent screws are provided to clamp the upper plate with lower plate. If both the plates are clamp then the lower Clamp is loosened, the instrument may be rotated about the outer axis while if the lower plate is clamped and the upper one is loosened, the instrument can be rotated about the inner axis.

What is the use of theodolite in surveying?

Theodolite is an instrument used in surveying to measure horizontal and vertical angles. It is also used for leveling, indirect measure of distances and prolonging a line etc. The line of sight of theodolite can be rotated through 180 o in vertical plane about its horizontal axis. Parts of Theodolite and their Functions.

What happens when upper clamping screw is tightened and lower clamp tightened?

If lower clamp screw is loosened and upper clamp screw is tightened, both plates can rotate together. Similarly, if lower clamping screw is tightened and upper clamp is loosened then, only upper plate is movable and lower plate is fixed with tribratch plate.

Which type of theodolite is more commonly used for triangulation?

The first type is more commonly used. The diameter of the graduated circle on the lower plate determines the size of theodolite. The common sizes are 8 cm to 12 cm while 14 cm to 25 cm instruments are used for triangulation work. (i) Always use the lower clamp and its tangent screw for left-hand object or for back sight.