LOW LIFT PUMPING MACHINERY, LXXV. 
each case must be considered on its merits, but he evidently 
favours the adoption of centrifugal pnmps. 
A Dutch engineer Mr. Korevaar has investigated the question 
as to the best pumps to adopt, and he states that the following is 
the efficiency obtained 
Scoop wheels 677 
Reciprocating pumps 707 
Centrifugal pumps 457 
And taken over a period of two years, the fuel consumption of 
the various types was in the follow proportions for equal work 
performed 
Scoop wheels 100 
Reciprocating pumps 100 
Reciprocating pumps sombined with wheels 98 
Centrifugal pumps 167 
These results are not borne out by others, for the substitution 
of the centrifugal pumps for wheels, has in all cases with which 
the author is acquainted resulted in a saving of fuel, but the 
wheels removed were of old make so that this cannot be taken as 
representative. 
The following table shews the actual horse power required for 
raising one inch of water for various areas per twenty-four hours 
TABLE II. 
Actual horse power required to raise water at different lifts to deliver 
at the rate of one inch per acre per twenty-four hours. 
ae Actual Horse Power. 
Da ' 
ae Acres. | Oren 
_100| 200| 300] 400} 500| 600, 700| 800| 900 | 1000 
10 48/ 96! 143] 19:1| 238] 286) 334| 382| 429) 47-7 
20, 96/191} 286| 38:2) 47°7| 57:3) 668) 76:4] 86°0/ 955 
30 143)| 28°6| 429] 57-°3/ 71°5| 86:0 100°3/ 114°4| 128-9 143-1 
40 191/382) 57:3] 76-4| 95°5 | 114-4 | 138-7 | 152°8 | 172-0 | 191°0 
| 23°8| 47-7) 715 | 95:5 | 1190 | 143°3 | 167-1 | 191-0 | 214°5 | 238-6 
60 | 28°6 | 57°3| 86-0 | 114-4 | 143°3 | 172°0 | 200°6 | 229-2 | 257-9 | 286°5 
70 33:4 66°8| 100°3 | 133-7 | 167-1 | 200°6 234-0 | 267-4 | 300°8 | 334-0 
80 38:2 76-4| 114-4 | 152-8 | 191-0 | 229°2 267:4 | 305-6 | 343°8 | 382°0 
42-9 86°0| 128-7 | 172-0 | 214°5 | 257-9 300°8 | 343°8 386°8 | 429°7 
100 | 47°7 | 95°5 | 143-1 | 191-0) 238-6 | 286°5 | 334-0 | 882-0 429°7 | 477°5 
