[3] 



WATER SUPPLY AT WOOD's IIOLL. 



217 



ryiug a drill screwed to its lower end, is tlien ])assed down tlir()u<>h the 

 first pipe and worked by hand, being turned one way and the other, or 

 driven down by the sledge-hammer, while a stream of water is forced 

 tljrongh it by a pump, passing out by openings near the drill, and wash- 

 the sand, pebbles, and debris of bi'(d<en stone uj) throngli the larger 

 l)ipe. 



When one length of pipe is driven nearly to the surface of the ground 



another is coupled to it, and so, 

 by alternate driving, drilling, 

 and washing, the pipe is diiven 

 to considerable depths without 

 much trouble unless bowlders 

 are met with, too large to l»c 

 brolxen u]) by the drill. Tn that 

 case the pipe is jtulkMl up and 

 started again in a new ])lace. 



The well E was successful at 

 40 feet, where a ])lenti('ul supjtly 

 of water was found in line gravel, 

 assaying (June 1) 15 grains of 

 chlorine (eciuivalent to 24.7 

 grains of salt) to the im]ierial 

 gallon, and flowing at the rate, 

 by hand ])um]), of 8 gallons per 

 minute. This well was after- 

 ward deepened to 47 feet, to 

 which depth the gravel contin- 

 ued to grow coarser, without 

 change in the How of water, and 

 with a diminution in the <|uan- 

 tity of chlorine. It was con- 

 cluded, however, by the agent 

 of the company that easier 

 driving would be found some 

 hundn'd yards or so further to 

 the eastward, and accordingly 

 the apparatus Avas moved to the 

 point nnirked F on the ma]), 

 and operations were resumed 

 at that place. 



Here the four wells were ( 1 r i ven 

 which furnish the present sup- 

 ply. There was some difliculty in driving, owing to the presence of 

 underground bowlders, and the pipes were several times drawn up and 

 started again in new places. Hence the four pi])es mark the corners of 

 an irregular quadrangle. They were finally sunk to an average depth 



