/ h
V = / ----------------------------------------------
\/ 0.0155463 - 0.000398d^{4} + 0.0000362962d^{4}l.

[TEX: V = \sqrt{\frac{h}{0.0155463 - 0.000398 d^4 + 0.0000362962 d^4 l}}.]

g being velocity of efflux in feet per second.
h, head in feet indicated by gauge.
d, of coupling in inches.
l, length of hose in feet from gauge.
v, velocity in 2½ inch hose.

Forty-five experiments were made on ring nozzles, resulting in the
following formula:

f = 0.001135v².

f being loss of head in feet owing to resistance of nozzle, and v the
velocity of the contracted vein in feet per second.

Thirty-five experiments were made with smooth nozzles, resulting in the
following formula:

f = 0.0009639 v².

f being the loss of head in feet owing to resistance, and v the
velocity of efflux in feet per second.

Experiments show that a prevailing opinion is incorrect that jets will
rise higher from ring nozzles than from smooth nozzles.