Pumping Stations. 121 



as the disc is so arranged that the water entering it supports the 

 moving parts. I'he pump is calculated to hft the following quantities : 

 — 121 tons at 9 feet; 115 tons at 10 feet; 109 tons at 11 feet; 

 104 tons at 12 feet ; 100 tons at 13 feet; 96 tons at 14 feet; 92 tons 

 at 15 feet; 89 tons at 16 feet. These quantities were exceeded at 

 the trials of the pump. The engine-bed occupies a space of 30 feet 

 by 5 feet 6 inches. The engine and pump were supplied by Messrs. 

 Hathorn, Davey & Co., of Leeds. The contract price, including the 

 well and fixing in the old building, the makers taking the old engines, 

 was 2700/. A drawing showing the arrangement of the pump and 

 engine will be found in * The Engineer,' vol Ivii., February 1884, and 

 an enlarged view of the pump is now given on Plate 6. Careful obser- 

 vations have recently been taken by Mr. Carmichael as to the con- 

 sumption of coal by this engine under ordinary working conditions, 

 the quantity of water delivered being ascertained by measuring the 

 quantity passing through the outlet drain. With a lift of 1 1 feet the 

 quantity of water discharged was 120 tons per minute, with a con- 

 sumption of 3 tons of Derbyshire coal in twelve hours. This is at 

 the rate of 6^ lb. per horse-power of water lifted per minute. The 

 quantity of oil used for lubricating is at the rate of i gallon in twelve 

 hours. The consumption of coal in this district has varied during 

 the last twenty years from about 250 tons to 1000 tons in a year 

 according to the rainfall ; the average cost for the years 188 1-3 (coal 

 being then about 15^". per ton) was for coal, 674/. ; attendance, oil, 

 &c., 252/. ; total, 926/. Taking the average Hft for both stations at 

 \o\ feet, this is equal to 14*81^. per acre, or per acre per foot of 

 lift, I '42^. ; or for coal only, i'02d. During this time both scoop 

 wheels were in operation. The main drain, which brings the water to 

 the pump, is 20 feet wide at the bottom, with slopes of i J to i. The 

 average depth of water when pumping is going on varies at starting 

 from 5 feet 6 inches to 3 feet at leaving oif ; the surface inclination 

 also varying from 2 J inches per mile to 4 inches. 



PRiCKWiLLOW.-This pumping station is for the drainage of a 

 large district in the South Level, being part of the Great Bedford 

 Level, in the county of Cambridge. The taxable area of the district 

 is about 11,000 acres; but the area of land actually drained by the 

 engines at Prickwillow is about 25,000 acres, the drainage of a large 

 area of higher land bordering on the Fens finding its way into this 

 Fen drainage system. The water is lifted by both engines into the 

 River Lark, al30ut fourteen miles above Denver sluice, where the 



