364 - University Geological Survey of Kansas. 
the most important improvement to be made. It would 
seem advisable to employ wooden pipes (at any rate on the 
centrifugal pumps), or to treat the pipes with some prepara- 
tion to prevent the action of the acid waters destroying 
them. It has been proposed to use tar and apply while hot. 
However, tar washes off quite readily ; so wooden staves have 
been used, lining the interior of the pipe, which protects the 
tar from abrasion. 
DRILLING. 
Drilling by compressed air and steam is gradually taking 
the place of hand work. Compressed air is excellent, as it 
forms a good means of driving the drill and also aids venti- 
lation. On the contrary, steam, when used in the drill, does 
not materially aid ventilation, but rather tends to make the 
mine air more difficult to work in, due to added moisture, and 
to produce a rise in the temperature. The passage of steam 
pipes for any considerable distance in the cool mine or on the 
surface causes a waste, due to radiation and condensation, 
especially in the winter months. Taking all the advantages 
and disadvantages into consideration, it is not advisable to 
use steam as a motive power for power drills. 
The above suggestions are given not because they are new, 
but because they have been and are successfully employed in 
many mining districts. There is no doubt but what some of 
the improvements mentioned above would prove as successful 
here as in other districts, and would greatly enhance the min- 
ing industry of the district. 
ADDENDA. 
Under this heading are grouped certain facts and data. 
which, taken in conjunction with the descriptions and dis- 
cussions of the body of the report, may serve to further eluci- 
date the principles, methods and processes given therein. 
The main object, however, in presenting this material is to 
illustrate present practice, especially in those parts in which 
progress has been most marked and rapid. Lack of time 
prevents a thorough, detailed review of the present practice, 
so that only that material that is at hand and available for 
this purpose is given. The subjects discussed must of ne- 
