Pumping Stations. 



117 



measured in the drain. The discrepancy between the power of the 

 wheel to lift, and the quantity of water dehvered in the feeding 

 drain, are therefore reasonably consistent with each other." If the 

 work be taken as that measured by the wheel with the dip of 4 feet, 

 the efficiency would be only 61 per cent. 



The Te?i Mile Station. — The scoop wheel at this station is 43 feet 

 8 inches diameter, having been increased 20 inches from the original 

 dimension by lengthening the scoops. There are 50 scoops, 7 feet 

 6 inches radial length by 3 feet wide. The average dip of the 

 scoops is 3 feet ; the greatest 5 feet 6 inches \ and the lift 1 1 feet 

 average, and 14 feet maximum. This wheel lifts the water into the 

 Ten Mile River, which is not tidal, the tide being shut out by sluice 

 doors at Denver Sluice. There is, however, a considerable rise in 

 the river during tide time. These scoops dip from the radial line at 

 an angle of 39°, being tangents to a circle of 18 feet diameter, and on 

 an average head and dip of 14 feet — 11 feet head and 3 feet dip — 

 enter the water at an angle of 34°, and leave it at an angle of 72°. 

 The wheel makes 4J revolutions a minute. When working to its 

 full extent, the wheel is capable of discharging 213 tons per minute. 

 This wheel has been provided with a movable breast as at the other 

 station. The engine for driving the wheel is similar in character to 

 that at the Hundred Foot Station, and was altered and adapted for 

 workina: with a hisrher pressure of steam in a manner similar to the 

 other. The cost of alterations at the two stations was over 6000/. 

 The estimated capacity of the two wheels at the maximum dip is 

 410 tons per minute. This is equal to a discharge of water due to 

 a continuous daily fall of 0*17 inch of rain. In the year 1883, 

 which was a very wet season, the engines ran as follows : — 



Total hours rua 



Coal consumed tons 



Average dip of the scoops .. feet 



Greatest ,, ,, .. .. .. .. ,, 



Average head.. ,, 



Greatest ,, •• »» 



Hundred Foot 



Ten Mile 



Engine. 



Engine. 



2288 



2280 



691 



589 



3'30 



3-08 



5*33 



4-58 



13*80 



Ii*i6 



17*2 



13*4 



The estimated discharge, calculated with the average dip of the 

 scoops given above, is 122 '12 tons per minute lifted 13*80 feet, 

 equal to 114*40 horse-power of water lifted, with a coal consumption 

 of 5*99 lb. per horse-power of water lifted for the Hundred Foot 



