270 Molesworth’s pocket-book
Time Employed in Filling and Emptying
Cisterns when the Supply and Consump-
tion ABE GOING ON AT THE SAME TlME.
Q = Supply of water into cistern in cube feet
per minute.
q — Consumption of ditto from cistern in cube
feet per minute.
C = Contents of cistern in cube feet.
T = Time required for filling cistern in minutes.
t — Ditto for emptying ditto in minutes.
Time Required to Empty Canal Locks, &c.
A = Area of lock in ft. a = Area of sluice in ft.
H = Head of water in feet.
T = Time required in seconds. T = —A?.
_v. . , Wil
This is under the supposition that the sluice is
constantly submerged; ao that its entire area is
available throughout.
The coefficient for lock sluices nas been as-
sumed to be about ’ 6.
Maximum Power of a Horse on Canals at
Different Speeds.
V — Velocity in miles per hour.
H = Duration of work in hours per day.
L Total load drawn by one horse on canal in tons
V. H. L. V. H. L
2i iii 520 6 2 30
3 8 243 7 U 19
3i ®T°o 153 8 if 13
4 102 9 9
5 52 10 ¥