## What is meant by line of sight and line of collimation?

Line of sight is the imaginary line passing through the intersection of crosshairs and optical centre of the objective whereas Line of collimation is the imaginary line passing through the centre of the eyepiece and the optical centre of the objective.

What is line of collimation method?

In levelling, a method of calculating reduced levels by subtracting staff readings from the level of the line of sight (collimation line) of the instrument. This method is usually favoured where it is required to obtain the levels of many points from one set-up.

What is line of collimation in levelling?

Line of Collimation or line of sight The line joining the point of intersection of the cross wires of the diaphragm to the optical centre of the objective and its imaginary continuation.

### When the line of collimation is horizontal?

The vertical circle must read zero when the line of collimation is horizontal.

What is meant by line of sight?

Definition of line of sight 1 : a line from an observer’s eye to a distant point. 2 : the line between two points specifically : the straight path between a transmitting antenna (as for radio or television signals) and a receiving antenna when unobstructed by the horizon.

What is the use of collimator?

collimator, device for changing the diverging light or other radiation from a point source into a parallel beam. This collimation of the light is required to make specialized measurements in spectroscopy and in geometric and physical optics.

## What is line of collimation in height of instrument?

Height of Collimation is the height of the horizontal plane through the telescope. In order to see the staff on the BM the instrument must be higher. To find the Height of Collimation (Instrument Height) add the staff reading to the level of the Bench Mark. Height of Collimation = BM + staff reading.

Is line of collimation parallel to the horizontal axis?

The line of collimation must be at a right angle to the horizontal axis. The horizontal axis must be perpendicular to the vertical axis. The axis of the telescope level must be parallel to the line of collimation.

What is trunnion axis in theodolite?

The horizontal axis about which the telescope of a theodolite can be rotated.

### What is the other name of line-of-sight?

In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for line of sight, like: line of vision, sightline, visible horizon, beeline, straight shot, optical-axis, field of view, field-of-vision, long wave, far field and ku band.