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The line of sight is kept as high above ground surface as possible to minimise the error in the observed angles due to
If i is the stadia distance, f is the focal length and d is the distance between the objective and vertical axis of the techeometer, the multiplying constant, is
The desired sensitivity of a bubble tube with 2 mm divisions is 30". The radius of the bubble tube should be
Tacheometric formula for horizontal distances using horizontal sights can also suitable be
Which of the following introduces an error of about 1 in 1000 if 20 m chain is used
The length of a traverse leg may be obtained by multiplying the latitude and
The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, is known
In the cross-section method of indirect contouring, the spacing of cross-sections depends upon
(i) Contour interval
(ii) Scale of plan
(iii) Characteristics of ground
The correct answer is
Transition curves are introduced at either end of a circular curve, to obtain
Ifa andb be the elevation of two subjects A and B respectively , q be the angle observed by a sextant. The correct horizontal angle is
Tilt of the staff in stadia tacheometry increases the intercept if it is