ARTESIAN WELLS. 567 
Cannon Ball placed in the Pipe of an Artesian 
Well is violently ejected by the ascending stream. 
In some places application has been made to 
economical purposes, of the higher temperature 
of the water rising from great depths. In Wur- 
temberg Von Bruckmann has applied the warm 
water of Artesian wells to heat a paper manu- 
factory at Heilbronn, and to prevent the freezing 
of common water around his mill wheels. The 
same practice is also adopted in Alsace, and 
at Canstadt near Stutgardt. It has even been 
D', E', through the clay beds A, B, C, D, E, the water from 
these beds would rise within a pipe ascending" from the perfora- 
tion, to the levels A", B", C", D", E". 
These theoretical Results can never occur to the extent here 
represented, in consequence of the intersections of the strata by 
valleys of Denudation, the irregular interposition of Faults, and 
the varying conditions of the matter composing Dykes. 
If a valley were excavated in the stratum M below A", the water 
of this stratum would overflow into the bottom of this valley, and 
would never rise on the side of the fault so high as the level H. 
Wherever the contact of the Dyke H, L, with the strata 
M, N, O, P, Q, R, that are intersected by it, is imperfect, an issue 
is formed, through which the water from these inclined strata will 
be discharged at the surface by a natural Artesian well ; hence a 
series of Artesian springs will mark the line of contact of the 
Dyke with the fractured edges of the strata from which the water 
rises, and the level of the water within these strata will be always 
approximating to that of the springs at H ; but as the permea- 
bility of Dykes varies in different parts of their course, their 
effect in sustaining v/ater within the strata adjacent to them, 
must be irregular, and the water line within these strata will vary 
according to circumstances, between the highest possible levels, 
A, B, C, D, E, and the lowest possible level H. 
