SSC JE 2023 Exam: What is Theodolite?

Are you aiming for the SSC JE 2023 Exam with confidence and determination? If yes, you might be curious about the tools that can pop up in the SSC JE 2023 exam. One of the tools that can spark a question or two in the upcoming exam is Theodolite. You don’t need to dive deep into the nitty-gritty of the topic. In this blog, we have summarized all the facts about Theodolite into bullet points, to help you recall everything related and respond accordingly.

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What is Theodolite?

A Theodolite is a highly precise instrument primarily used to measure the horizontal and vertical angles between two points. It has a wide range of applications, including line prolongation, indirect distance measurement, leveling, and acting as a tachometer. Due to its versatility, it is often referred to as the “Universal Instrument.”

Types of Theodolites

There are two main types of Theodolites:

1. Transit Theodolite: This type of Theodolite features a telescope that can be rotated in a full 360-degree revolution around its horizontal axis within a vertical plane.
2. Non-Transit Theodolite: In contrast to the Transit Theodolite, the Non-Transit Theodolite does not allow the telescope to complete a full 360-degree revolution around its horizontal axis within a vertical plane. However, it can still be rotated to a certain extent to measure vertical angles.

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Key Points to Remember

• Line of collimation: It is an imaginary line passing through the intersection of the crosshairs at the diaphragm and the optical center of the object-glass and its continuation.
• Axis of Bubble tube: It is an imaginary line tangential to the longitudinal curve of the bubble tube at its midpoint.
• Axis of a telescope: This axis is an imaginary passing through the optical center of the object-glass and the optical center of the eyepiece.

Sample Question

Question: If the telescope of a theodolite can rotate about its horizontal axis in the vertical plane completely then the theodolite is termed as:
 (1) Optical theodolite
 (2) Azimuth theodolite
 (3) Transit theodolite
 (4) non-transit theodolite

Answer key : 3

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