DETAILED ACCOUNT OF SOME RECENT EXPERIMENTS. 31 



a sheet of excellent water was tapped under sufficient pressure to 

 cause it to overflow at the surface. The flow was not abundant, but 

 it is possible that sands bearing a more abundant supply exist lower 

 down. Unfortunately the boring could not he carried deeper than 

 1,336 feet. It was executed by Mr. Trowbridge, an engineer highly 

 experienced in these matters, who was specially selected for this 

 work by Messrs. Pierce and Co. of New York, one of the leading 

 American firms that have made deep boring a speciality. It had not 

 been anticipated that the boring would have had to be put down to 

 such a depth entirely through unconsolidated alluvial formations. 

 The bore-hole had to be lined throughout its entire depth, and as 

 each size of pipe can be sunk only through a limited depth, the lining 

 had been reduced to 3 inches diameter when it reached a depth of 

 1,264 feet, the greatest depth to which it was found possible to sink 

 the pipe, although the boring had been commenced with a 12-inch 

 pipe. The following statement contains particulars relative to the 

 lining : — 



Length. 



408 feet. 



793 „ 



VS ,1 

 1,100 „ 



298 ., 



246 „ 



Boring continued to 1,336 feet. 



The following information was given by Mr. Trowbridge in his 

 report to the Municipal Board of Lucknow : " From the surface 

 down to about 400 feet, the whole soil appeared to be saturated with 

 water, its natural level being about the same as surface water. From 

 400 to about 750 feet there was no appearance of water, but at that 

 point, a bed of water-bearing sand was struck, and the water raised 

 to within 13 feet of the surface, which is about 32 feet higher than 

 the Gumti river when at its lowest stage. From 750 feet to 1,220 

 feet, occasional beds of water-bearing sand were found, which in 



( 3i ) 



s 



ize Of 



pipe, 



f. 



12 in 



ches. 



2. 



10 



11 



3- 



8 



11 



4- 



6 



it 



5- 



4 



„ 



6. 



3 



i> 



Depth driven. 



Total depth, 



408 feet. 



408 feet. 



390 .. 



798 „ 



100 „ 



898 „ 



202 „ 



1,100 „ 



£9 „ 



1,189 „ 



77 .. 



1,254 ,, 



