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538 MOLESWORTH^ POCKET-BOOK
Table of Low-pbessl’bk Tübbtnes.
(From actual Practice.)
h — Head of water in feet.
V = Velocity of centre of buckets in ft. per sec.
Q = Quantity of water in cube feet per second.'
R = Revolutions of turbine per minute.
HP = Effective horse-power.
h. 1 V. । 5 HP. 10 HP. 15 HP. 20 HP. 30 HP.
Q. i
Q. i R. Q. 1 R.
Q. R. Q. R.
21 9-48 25 34 50 I 24 75 1 20 100 1 it| — —
5 13’41 12-5 81 25 1 57 38 1 47 50 41 75 33
H 16-43 8*5 136 17 97 25 79 33 68 51 56
10 18-97 6-3 180 12-6 128 19 105 25 90*38 75
15 23-23 4-2 319 8’4 226 12-6 185 17 160 25 131
20 26'83 —. 6’3 329 9-3 273 12’6 232'18-9 194
25 30-00 — — — — 7'5 358 10 310'15-0253
30 3M" 86 •— — — •— — 8*4 380 12-6 310
40 HP. 60 HP. 60 HP. 70 HP. 80 HP.
h. v. — —— — —.— — _— .
Q. B. R, Q. R. Q. B. Q- R.
5 13-41 100 28 126 26 — — — — — ——
11 16-43 68 48 85 43 102 40 120 36 136 34
10 18-97 50 64 63 58 16 53 88 48 101 48
15 23-23 33 113 42 100 51 92 60 85 67 80
20 26’83 25 164 31 148 37 136 43 123 51 116
25 30-0 1 20 220 25 196 30 179 35 166 40 155
30 32-86 268 21 240 25 219 30 227 34 190
1 ♦
DIAMETER OF UPRIGHT SHAFT.
P = Horse-power, effective.
d = Diameter of shaft in inches.
Il = Number of revolutions per minutej
, ?/90P~
d ~ 1C