On the Artesian Well of Grenelle. 143 



the following strata have been found, viz. green and grey clays 



{a in the section) ; a bed of fine sand, containing water (6) ; 



gravel and rolled stones (c) ; and a calcareous and argillaceous 



bed «). 



The following dimensions of the bore are given in French 



metres : — 



From the surface to the commencement of the first tube, 2'".30 



Length of the first tube, 148 



Length of the second tube, 207 



Length of the third tube, t>9 



Length of the fourth tube, 113.70 



, From the extremity of the tube to the bottom of the bore, 7 



Total, 647™. 

 Or 1794i English feet. 



The diameters of the different tubes are indicated in the figure, 

 and are respectively, proceeding from above, 0™.31; 0™.27; 

 0^.22 ; and 0'".162. It thus appears that the diameter of the 

 highest tube is about a foot English, and of the lowest about 

 6 inches. 



The quantity of water thrown up is estimated at 4,000,000 

 litres per diem, or in round numbers nearly 880,000 imperial 

 gallons. 



It appears from the analysis of M. Pelouse, member of the 

 Institute, that the water is purer than that of the Seine. 



The temperature of the water is 28° Cent. =82°.4 Fahr. 



The expense up to the time when the water first made its 

 appearance amounted to, ... 262,375 francs. 



The copper-tubes will cost, . . 40,000 do. 



Total, 302,375 francs. 

 Or upwards of L.12,000 Sterling. 



The letter X marks the point where it is intended to com- 

 mence the series of internal tinned copper-tubes, which are to 

 be isolated from the iron by means of rings of tow impreg- 

 nated with bitumen, and fixed to the inferior tube en tole by a 

 screw, in which will be applied an oily varnish as well as a 

 band of caoutchouc. These tubes are indicated by the inner 

 dotted line. 



