CRANE. | Pumping Machinery. 305 
pletely fills the openings, and thus enables the buckets to raise 
the water in a manner similar to that of a chain pump. The 
cross-sectional area of the opening in the tube is multiplied 
as many times as there are spouts or openings employed. 
The speed of flow depends largely upon the linear speed of 
the belt or belts per minute. 
A large amount of water can be raised per day with this 
form of pump, but it is easily gotten out of repair and is dif- 
ficult to put in working shape again. Then, too, the wear is 
great, both on the belts and in the tube. The lift of such a 
pump is low, seldom exceeding 35 to 50 feet. These pumps 
are not to be recommended except for special work and occa- 
sions. They are also occasionally used as mill pumps for 
elevating mill water and slimes. 
ia 
SSS 
Lg  ). 0"—F°F=é"E 
Sia ame 
i= 
== l > 
—EE 
SSX 
CRANE | 
Fig. 78. Column pipe for belt bucket pump. 
THE CORNISH PUMP. 
The Cornish pump has been for many years and is yet the 
mainstay in this district. As a reliable, economical and effi- 
cient pump it cannot be excelled for certain kinds of work 
under widely varying conditions, and as constructed and 
