284 University Geological Survey of Kansas. 
THK WILFLEY TABLE. 
In this table are incorporated some of the features of plain 
and rifled tables and has in addition to these a shaking mo- 
tion. The result is a very efficient and easily handled appara- 
tus, and of a fairly large capacity, even on low-grade materials, 
such as the tailings from the large concentrating mills. 
A description of one of the earlier forms of Wilfley tables, 
which incorporates the principle of the apparatus, is taken 
from a circular issued by the manufacturers; although the 
tables in use at the present time differ somewhat from the 
earlier form, yet the principle is the same, as is the general 
arrangement of the table: 
‘‘The table consists of a flat surface seven feet wide by six- 
teen feet long, covered with linoleum, upon which are a series 
of riffles. These riffles extend nearly the full length of the 
table on the discharge side and grow shorter as the feed cor- 
ner of the table is approached. 
‘“‘The pulp is fed upon the table near the movement end 
and flows down the adjustable inclined surface across the 
series of riffles towards the tailings discharge. The move- 
ment is so constructed that the table has a quick motion at 
the outer end of its stroke and a much slower motion at the 
inner end. This movement causes the ore particles to settle 
in layers, leaving the clear siliea at the top, exposed to the 
action of a stream of wash water, and at the same time causes 
the entire mass to move up the slight incline of the table 
towards the concentrates box. The pulp is fed upon the table 
through a series of small holes in the side of the pulp box, 
and during the entire time it is upon the table it is kept con- 
stantly under a thin sheet of wash water, which prevents any 
loss through the mineral floating off on the surface of the 
water, which is a frequent source of loss in other tables. 
‘‘The riffles mentioned above are one-quarter inch in 
height at the movement end and taper to a feather edge to- 
wards the head end. As the pulp moves up the table the 
upper layer of sand is carried over the riffles by the wash 
water, while the concentrate is being steadily settled and a 
fresh layer of sand is brought to the surface. ‘The .concen- 
trates, after being freed from the greater part of the sand, 
