QUESTION
Objective Question
In plane tabling the instrument used to measure horizontal and vertical distances directly is
known as
Answer
( Option B)
Telescopic alidade
Solution
Telescopic Alidade: It is specifically designed for plane table surveying. Equipped with a
telescope and stadia hairs, it allows the surveyor to compute both horizontal and vertical
distances directly without using a separate chain or tape,alongside taking inclined lines of
sight.
Simple Alidade: This instrument only contains sight vanes (slits) and can only be used to sight
objects and draw lines of sight. It cannot measure distances or vertical elevations directly.
Tacheometer: While a tacheometer also measures horizontal and vertical distances using
stadiasystems, it is a separate transit-theodolite instrument used in tacheometric surveying,
not a direct plane tabling accessory.
Clinometer: A clinometer is used strictly for measuring angles of slope, elevation, or
depression, rather than direct distance measurement.
