298 University Geological Survey of Kansas. 
called by various names, belongs to the two well-known 
classes, spitz kasten and spitz lutten, the use of which is 
about equaily divided. No special rule seems to be followed 
in the construction of these classifiers ; the object apparently 
being a crude attempt with crude apparatus to catch a small 
amount of material, which would otherwise be lost. During 
the last few years, however, the importance of this class of 
apparatus has been partially realized, which has led to a 
closer adherence to the regulation method of construction. 
Following is a short description of the forms in common use: 
A top and side view of one form of settling tank, as com- 
monly called, is shown in figure 75. The tank is made of 
one inch board usually fastened to the end of the jig, through 
which all the jig water, except the gate and spigot discharges, 
passes. ! 
The water from the jig first passes over the partition, A, 
into the first compartment of the settling tank, C, down un- 
der the partition, D, thence into the second compartment, F, 
from which the settlings are largely drawn off through the 
opening, G, and to a less extent through O. The overflow is 
through the spout, H, which is reached by passing around 
the partitions, J and K. The partitions, M and K, act as 
checks to the overflow, and cause more sediment to be thrown 
down. This is collected in the bottom of the compartments, 
C and F, from which it is shoveled from time to time or run 
off by a spigot at G and O, as stated above. 
The dimensions of the compartments are generally twelve 
inches wide, 24 and 30 inches deep. 
Another form of settling tank is shown in 4, figure 65, 
which is anend view. ‘The water flows in over the side, AB, 
and reaches the main outlet, K, after having passed through 
the tank. The rising currents are checked by the partition, L, 
around which they must pass. The settlings are drawn off 
through the spout, C. This last form of settling tank is not 
very efficient and saves but little sediment, except when the 
tank is quite large. 
In figure 76 is shown another form of settling tank, 
which does not differ materially from the forms above de- 
scribed, except that it is not attached to any other form of 
