==>>QUESTION BASED ON SURVEYING<<==

1. Define Tacheometer.
It is an ordinary transit theodolite fitted with an extra lens called analytic
lens. The purpose of fitting the analytic lens is to reduce the additive constant to zero.


2. Define Substance bar:
A Substance bar is manufactured by Mr. Kern. The length of the substance bar is
2m (6ft) for measurement of comparatively short distance in a traverse. A Substance bar
may be used as a substance base. The length of the bar is made equal to the distance
between the two targets.


3. What do you mean by Fixed hair method:
In this method, the stadia wires are fixed (or) fitted at constant distance apart.


4. State Stadia intercept:
The difference of the distance between the top and bottom cross hairs is called as staff
intercept


5. What do you mean by tangential method:
In this method, the stadia hairs are not for taking readings. The readings being
taken against the horizontal cross hair.
.
6. The tangential method:
In this method, the stadia hairs are not for taking readings. The readings being
taken against the horizontal cross hair.


7. What is the principle of stadia method?
The method is based on the principle that the ratio of the perpendicular to the base
is constant to similar isosceles triangle.


8. What are the systems of tacheometry measurements?
The stadia system
The tangential system
Measurement by means of special instrument.


9. Define Sub tense method:
In this method stadia interval is variable. The staff intercept is kept fixed while
the stadia interval is variable lines.


10 State Staff intercept:
The difference of the reading corresponding to the top and bottom stadia wires.


11. What are the merits and demerits of movable hair method?
Merits:
Long sights can be taken with greater accuracy than stadia method
The error obtained is minimum
Demerits:
The computations are not quicker
Careful observation is essential


12. Define Analytic lens:
Analytic lens is an additional lens placed between the diaphragm and the
objective at a fixed distance from the objective. This lens will be fitted in ordinary transit
theodolite. After fitting this additional lens the telescope is called as external focusing
analytic telescope. The purpose of fitting the analytic lens is to reduce the additive
constant to zero.