3. a) Find the difference in elevation between the stations P and Q f…

Question

3. a) Find the difference in elevation between the stations P and Q from the data given below. The stadia constants are K=100 and C=0.3.

Inst at. | Staff at | Vertical angle | Stadia readings

A | P | +3°54' | 1.355, 2.580, 3.935

| Q | -1°36' | 0.985, 1.66, 2.335

b) Derive an expression for the horizontal distance D and vertical intercept V when the staff is vertical and normal.