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What is used in centering aid in theodolites, compass, plane table and variety of other surveying instruments?

What is used in centering aid in theodolites, compass, plane table and variety of other surveying instruments? Correct Answer Plumb bob

Plumb bob transfers points to the ground so it is used for centering. Butt are used for measuring offsets.

Related Questions

Consider the following statements for deflection and null type instruments: 1. Deflection type of instruments are more accurate than null type of instruments. 2. Deflection type of instruments can be highly sensitive as compared with the null type of instruments. 3. Null type of instruments are more suitable for measurements under dynamic conditions than deflection type of instruments. Which of the above statements are not correct?
Consider the following statements in connection with deflection-type and null-type instruments: 1. Null-type instruments are more accurate than the deflection-type ones. 2. Null-type of instrument can be highly sensitive compared to a deflection-type instrument. 3. Under dynamic conditions, null-type instruments are less preferred to deflection-type instruments. 4. Response is faster in null-type instruments as compared to deflection-type instruments. Which of the above statements are correct?
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