LXXVI. T. H. HOUGHTON. 
for different heights, the indicated horse power varying of course 
with the type of pump used. Or if the work to be done is expressed 
in million gallons per twenty-four hours, the actual horse power 
= millions per day x height of lift in feet x ‘21. 
The costs of pumping plants of any one of the types described 
in the paper naturally vary very considerably, and the circumstances 
of each case have to be considered before deciding which is the 
best pump toadopt. In the following tables the author has given 
the average cost per actual horse power, but they can only be 
considered as approximate, for a pump delivering a large quantity 
of water against a low head, costs more than one raising only one- 
third the quantity, to three times the head, although the horse 
power is the same. ; 
The prices include engines, but not boilers, and delivery in 
Sydney, it generally follows that the cheaper the pump for any 
particular work, the greater the cost of the boiler, and also of the 
fuel bill. The average steam consumption per actual horse power 
is also given in the tables for each type. 
TABLE III. 
Average cost of Pump and Engines per Actual Horse Power. 
a Centrifugal Pumps |», Reciprocating Pumps. 
Power. Pt 4) Pepe 1 2 3 
0 i Uf eae os oe a 
10- 20 Waa 1k 12 oF £49 
20- 30 ee aS 11 39 
30- 40 “a Yu 12 Sus £25 31 
40-— 50 SRS eres we 22 28 
50-— 75 10 £17 | oF 19 25 
75-100 o ids. a 17 24 
100-150] .., ae) ee es 16 23 
150 — 200 oe 12 | od oF 15 22 
Lage ~— . Lol 
as ia6 (34 j|gn | 82 [a8 
BL $6 } 4 aS oS me eo ey 
a2 omRS) | ae a8 | Eg i 
Buti hee 1 aoa Lae Be | Bes 
BS$8\/53$3/s8883|s8.15888-+ 83s 
220 n ° a i) es 2wO a ° 
Sa | Sos | Bot | 848 | Bot | S24 
vei) oi) 2k | (22 | 29h) Ok 
geo | en | gen | gee) ee | dea 
s2% 380 g8a gs seu | gam 
aed | a@h | ak |aSai | ase | and 
