Crank.| Prospecting, Mining and Milling Machinery. 291 
vertical shaft. To the lower end of the shaft, Z, is fastened 
a hollow cup-shaped casting, F. A double row of one-halt- 
to three-fourths-inch holes is drilled through the sides of the 
casting near the base. Above the row of holes six arms, G, 
of gas pipe are screwed into the casting. These arms extend 
outward for three feet from the casting and terminate in a 
square plate hinge, H. Through the outer half of the hinge 
is attached by a threaded connection another piece of gas pipe 
of the same size as the first portion of the arms, G, which are 
about four feet long and are really prolongations of the arms 
proper. These broken arms furnish support for canvas 
sweeps, J, which are fastened to the outer portion. 
HAND SWEEP 
SIDE VIEW 
Fig. 71. Plan and elevation of hand buddle. 
A launder, J, provided with a perforated screen, K, at the 
upper end, extends to and encloses the shaft, Z. The hole 
through which the shaft passes is purposely made several 
times larger than the shaft, to allow the escape of the slime 
between the same and the sides of the opening. A partition, 
L, prevents any slime passing down the launder except that 
which passes through the screen, K. A water pipe provided 
with a 7 connection at the end, into which are screwed short 
pieces of pipe with their outer ends closed, hangs directly 
over the upper part of the launder, J, and directly over the 
