The vertical distance between the line of sight and the horizontal line (V) in an inclined sight using a Tachoemeter with staff held vertical (in standard notations) is given by:
1
V = ks cos θ . sin θ + C sin θ
2
V = ks tan 2θ + C sin θ
3
V = ks cos θ . sin θ – C sin θ
4
V = ks cot 2θ + C sin θ