[ i 7 6 ] 



2 or 3 feet above the water level by means of an iron strap, e t 

 with bolts (I and III) in order to keep them firmly in their 

 proper position. The pipe should not be fixed vertically, but 

 on an incline, according to the slope of the chain (Fig. I), in 

 order to avoid friction as much as possible. The chain-pulley 

 should be worked at the rate of 25 to 40 revolutions per 

 minute, according to depth of well, from 4 to 25 feet, res- 

 pectively. The following are the approximate capacities of 

 a Chain-pump Hand-lift for different depths of well, if worked 

 by two good coolies : 



224. Fig. 42 (IV and V) shows a Double Chain-pump 

 Lift worked by bullock-power. It has about three to four 

 times the capacity of a Hand-power Lift, and it can be conveni- 

 ently worked up to a depth of 40 feet. It consists of a bul- 

 lock gear, the horizontal shaft of which carries two chain- 

 pulleys, // each working a chain-pump. The gear is fixed 

 with four bolts on two beams, m m } walled into the masonry 

 on the top of the well. The top parts of the pipings, n n, 

 are fixed with four bolts on two other beams, o o, also walled 

 into the masonry of the well. A fifth beam, />, serves for 

 fixing the lower part of the pipes similarly as described before 

 for the Hand-lift, 



