Records of the Geological Siirvei/ of India. 
144 
[vOL. XIIT, 
the following composition, as embodied in the Proceedings of the Commission of the 28th 
December 1878:— 
Sulphate of lime .... 
0,1050n 
Carbonate of lime .... 
■ I 
Silica ...... 
■ > 0,0210 f precipitated by 
Magnesia ...... 
• 1 1 soap and water. 
Iron (traces of) . 
. J ) 
Chloride of soda .... 
0,1800 
Total 
0,3060 
These proportions not constituting a perfectly drinkable water, though very useful for- 
watering the garden, the Commission determined to carry on operations to a greater depth. 
The tubing was accordingly continued with pipes of the same diameter as at the beginning. 
From the 30th December, under the impetus given to the works, the hydrostatic level com¬ 
menced to fall, and in consequence the discharge of water underwent the same diminution. 
Prom 1‘28 metres which it had attained, there was not more than 1'005 of a metre on the 31st 
December, '83 on the 4th January 1879, and on the 6th (having attained a depth of 62'64 
metres), the level was '01 below the level of the ground. 
Prom the 6th to the 13th January, the works were continued and pushed on to 68‘7&. 
metres.. On the 13tb, a second gush of water showed itself, which rose at length to 0*40 of a 
metre above the ground, but the piping became more and more difficult. A deviation of ‘07 
of a metre had already been noticed in the vertical projection of the column which caused 
friction at the bottom of the last pipe, the soupape a boulet continued to act, but the results 
were very poor. At one time, every offoii that was made, could not overcome the resistance 
in sinking the column on account of the pressui'e of the sand against the sides. The situation 
was serious and very embarrassing. It was seen, moreover, that the hoop which protected the 
bottom of the first pipe was displaced, and that the “ trepan ” of the “ soupape ’’ struck it at 
every stroke and brought away fragments of it. It was necessary to use repeatedly the large 
trepan which entirely detached the hoop and ground it into small pieces. The crane which was 
lifted by the pressure of the jackscrews was successively charged with weights varying from 
1 920 kilos to 6,070 kilos. Notwithstanding this pressure, the resistance was still great. The 
“ soupape ii boulet” continually brought up the debris of the hoop .and the pipe to which- it 
was rivetted ; the work of boring was almost at a standing, and the crane continued to rise. 
It was then loaded with a total weight of 19,290 kilos. A small sounding probe was lowered 
down the tube, which penetrated to a depth of of a metro in the ground and brought away 
traces of bluish clay. The boring was then at 68’81 metres, which showed the depth sunk 
durin" the day to bo only ’06 of a metre. The hydrostatic level which rose for a moment to 
1'03 fell to 0'95, and, on the 16th January, was not more than •25 of a metre above the 
ground. It rose and fell, alternately, from '73 to '69 of a metre, and eventu.ally fell down to 
■12 below the ground-level, while the tubes were not able to be driven in more than '67 of a 
metro in a week. 
The works were proceeded with nevertheless, but the results were very poor. We were 
liowever, on the point of overcoming the resistance to the driving in of the pipe. When the 
column had passed the water-bearing strata, the water caused an opening between the 
exterior of the piipos and the ground penetrated. From that time the work became easier; 
resistance diminished, and the “soupape ” having reached the coarse sand, operations became 
a great deal more satisfactory. 
On the 3rd February, there was a third gush of water, the hydrostatic level of which 
rose to ‘38 of a metre above the level of the ground. The boring had then reached to 73-60 
