456 



SCIENTIFIC RECREATIONS. 



thick, with an aperture of two inches or rather less, and three or four yards 

 in length. The lower portion should be pierced with holes, as in the illus- 

 tration, and terminating in a point of extremely fine-tempered steel. This 

 tube can be driven into the ground by mallets, or by the suspended hammer, 

 worked as shown in the illustration (fig. 484). This work will be easily 

 accomplished, and when the first length of tube has been driven in, another 

 can be fixed to it and hammered down in the same way. 



When the tubes have been driven to the depth indicated it will be as 

 well to let down a sounding line, a simple cord sustaining a pebble. If the 



Fig. 484. Tube Well. 



stone be pulled up dry, another length of tube can be added, or the tubes can 

 be pulled up, and another trial made. If, on the contrary, the pebble come 

 up wet, the object is accomplished, and a small pump can be fixed to the 

 upper end of the tube, as in fig. 485. At first the water will be found a little 

 thick and muddy, in consequence cf the disturbance of the soil and the particles 

 adhering to the end of the first tube ; but after an hour or so it will be 

 found that the water has become quite clear. It need scarcely be said that 

 if the water possesses sufficient ascensional force to rise to the level of the 

 ground a pump need not be employed. An Artesian Well will, in that 

 case, be the result. 



