In: Civil Engineering
What is this asking ???
A surveyor compares the bearings at two ends of a line underground by using a gyrotheodolite. The results at each end can be compared after they are corrected for grid convergence, meridian convergence, deflection of the vertical and index error in the instrument. Could the effects of deflection of the vertical be ignored in practice? (Look up some values of the deflection of the vertical in extreme cases, and estimate how much they affect directions).