The cistern shown in Fig. P2.59 has a diameter \(D\) that is 4 times the diameter \(d\) of the inclined tube. Find the drop in the fluid level in the cistern and the pressure difference \(\left(p_{A}-p_{B}\right)\) if the liquid in the inclined tube rises \(\ell=20 \mathrm{in}\). The angle \(\theta\) is \(20^{\circ}\). The fluid's specific gravity is 0.85.

Figure P2.59

D PA d PB