June I, iSSS.] 



SCIENTIFIC NEV/S. 



507 



from La Nature, reproduces the principal types of the 

 Cyclopean tools used for boring, for cleansing, for draw- 

 ing samples, for widening the sides, etc. By means of 

 the samples, which are cylindrical blocks brought to the 

 surface, it is possible to draw exact sections of the strata 

 which the borings have traversed. The trepan, byalter- 



sands are met with they are supported by tubes of 

 wrought-iron, and when the bed of water is struck tubing 

 is inserted, which serves for the ascending column of 

 water. 



The tubing is made in sections of thick sheet-iron, from 

 6| to 20 feet in length, rivetted together so as to form a 



Fig. I. — Boring Tool, 56 Inches in Diameter. Fig. 2. — Receiver, with Seven Clack Valves, for Raising the 

 Debris. Fig. 3. — Sectional View of Receiver, with Internal Pump, Used for Raising Sand when 

 IN Great Thickness. Fig. 4. — Receiver, Formed of Eight Clack Tubes, Used for Clearing an Annular 

 Space so as to Obtain a Sample Core. Fig. 5. — Sample Core Ready to be Raised. Fig. 6. — Sectional 

 View of Core Being Raised. Fig. 7. — Tool, with Eight Friction Wheels for Straightening Lining Tubes 

 ij Metres in Diameter, and for Bre.\king Up Piping which has Become Damaged. 



nating and repeated blows, fractures and crumbles the 

 hard layers at the bottom of the hole, and these fragments 

 are brought up by the cleansing process. If yielding 



single rigid column from the top to the bottom of the 

 well. It is curious to see these tubes superimposed 

 upon each other with accyracy, whilst within the enor- 



