From Figure 24.3,

V = D tan q₁

and s - V = D tan q₂

Thus, s = D ( tan q₂ + tan q₁ )

-------------------- Equation (24.7)

-------------------- Equation (24.8)

Therefore R.L. of Q = (R.L. of P + h) - V – r -------------------- Equation (24.9)

where, h is the height of the instrument, r is the staff reading corresponding to lower vane.

<< Back | Next >>