What is the primary purpose of tacheometry in civil engineering?

To determine horizontal and vertical distances of points on the earth's surface rapidly without using chains or tapes.

Fill in the blank: The ______ method of tacheometry uses a telescope fitted with fixed stadia hairs.

Fixed Hair Method

True or False: The tangential system of tacheometry is considered superior to the stadia system due to its efficiency.

False. The stadia system is generally considered superior due to its speed and accuracy.

Riddle: I help you measure distances quickly, using angles and a sight. What am I?

Tacheometer

Which of the following is NOT a use of tacheometric methods? A) Hydrographic surveys B) Checking measured distances C) Seismic surveys D) Preparing topographic maps

C) Seismic surveys

Fill in the blank: The instrument commonly used for tacheometric surveys is an ordinary transit theodolite fitted with a ______.

Stadia diaphragm

True or False: The movable hair method in tacheometry requires a separate leveling instrument.

False. It does not require a separate leveling instrument.

Short Answer: What is the formula for horizontal distance in the fixed hair method?

D = (f/i)s + (f + d)

Riddle: I am measured with angles and my readings can vary based on sight. What am I?

Vertical distance

What is the advantage of using the stadia method over direct measurement methods?

It allows for rapid measurement of distances and elevations, especially in difficult terrain.