Stadia Interval Factor

In Topographic Drawing, we solved the problem to get the Stadia Interval Factor with the formula of K=D/S wherein:
K= stadia interval factor,
C= stadia constant,
S= stadia hair reading(upper, lower), and
D= distance from the transit.

We solved this problem to determine the stadia interval factor of the instrument assume that the stadia constant is zero(0). The data were located on the table of point A,B,and C:

Solution:
Ka=D/Sa-Sb
=30/0.96-0.66
=30/0.3
=100.0
Kb=D/Sa-Sb
=45/1.10-0.64
=45/0.46
=97.83
Kc= D/Sa-Sb
= 60/1.21-0.60
= 60/0.61
= 98.36
AveK= Ka+Kb+Kc/3
= 100+97.83+98.36/3
= 296.19/3
= 98.73
Table:

Point	Distance from the Rod	Upper	Lower
A	30	0.96	0.66
B	45	1.10	0.64
C	60	1.21	0.60