Pumping Stations. 125 



ing machinery were advertised for, and that of Messrs. Appleby 

 & Co. was accepted. The new machinery, the arrangement of 

 which is shown on Plate 6, was erected in 1877, and consisted of a 

 scoop wheel 24 feet in diameter by 4 feet wide, and, according to 

 the maker's calculation, capable of delivering 3500 cubic feet (98^ 

 tons) per minute to a height of 4 feet, equal to 2 6 • 5 1 horse-power of 

 water lifted. The wheel makes five revolutions a minute, equal to 

 a speed of 6 '27 feet per second at the periphery. It is constructed 

 principally of wrought iron. The scoops, eighteen in number, 

 10 feet long, and -^-^ inch thick, are curved and shrouded by 

 wrought-iron plates, and are connected to the wheel by curved arms, 

 2 inches by 2 inches by | inch. The sides are -f-^ inch thick at the 

 periphery to | inch at the centre. An adjustable curved shuttle is 

 provided at the inlet to the wheel by which the admission of the 

 water is regulated. This shuttle is supported at the top by two 

 arms which project and clasp the axle of the wheel. Part of the 

 pressure of the water against the shuttle is thus brought to bear on 

 the [axle, causing considerable friction. The sill over which the 

 water is delivered is curved to the radius of the wheel. The wheel 

 is keyed on to a wrought-iron shaft 9 inches in diameter, which runs 

 in adjustable gun-metal beanngs. On one side of the wheel is bolted 

 a geared wheel made in segments 20 feet in diameter, of 3-inch pitch 

 and 6-inch face, and into this works the pinion on the engine crank 

 shaft The engines are of 40 nominal horse-power, of the horizon- 

 tal high-pressure, compound condensing type. The high-pressure 

 cylinder is 10 inches in diameter and 20 inches stroke. The low- 

 pressure cylinder is of 20-inch diameter and 20-inch stroke. The 

 low-pressure cylinder and condenser are on one base, the air-pump 

 being fixed in the chamber of the condenser. The high-pressure 

 cylinder is placed on a separate base parallel with the other 

 cylinder. The fly-wheel is 9 feet in diameter. Steam for the engines 

 is generated in two Cornish boilers, 20 feet long by 5 feet diameter, 

 fitted with Galloway tubes, the safety valves being weighted to a 

 pressure of 80 lb. of steam. The engines and boilers are contained 

 in a brick building. The chimney is of brick, built square, 60 feet 

 high. The contract price for building and machinery was 2680/., of 

 which 700/. was for the buildings, chimney, and casing for wheel. 

 This is equal to 74*68/, per horse-power of water lifted for the 

 machinery, and 26*40/. for the buildings, together ioi-o8/. This is 

 the only wheel in the Fen-land that has curved scoops. The head 



