Theodelite

Introduction:

A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are used mainly for surveying applications .

A modern theodolite consists of a movable telescope mounted within two perpendicular axes the horizontal or vertical axis, and the vertical axis. When the telescope is pointed at a target object, the angle of each of these axes can be measured with great precision. 

Working:

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. The internal spirit level makes sure the device is level to to the horizon. The graduated circles, one vertical and one horizontal, allow the user to actually survey for angles.

Instrumentation in engneering survey

surveying is completely based on instruments

Importance of instruments:

instruments play a key role in modern type of land surveys or more preferably engneering survey. Machines in todays world had made our work alot easier than before. In early times we used very errarious methods for surveys due to which our results were affected and we could not get what we wanted.

For example in early times plan distance was measured by counting our steps and you can well imagine how errarious measurement could be made as compared to modern ways of measuring techniques with modern instruments

Importance of instruments in survey can well be imagined from the fact the world is getting closer day by day with emerging technologies which had made our lives completely dependent on machines and made our daily works easy and production of these machines could only be possible with surveys designed for it and these accurate measurements were only possible because of instruments.