SOLID COMPRESSION SQUIRTERS. 
261 
may be dispensed with to allow the wheels to rua loosely on the axle, In which case a 
collar, C*, is placed on either side of the hub, b, with a set-screw, t 4 ,to keep the wheel 
from sliding longitudinally on its axle. The described application of the wheels, 
B B, to their axles serves to enable the operator to set them at any distance apart 
required to suit the distance apart of the rows of any field to be operated upon. 
u The axle, C, is provided with a pulley, D, which, by means of a belt, drives a pulley 
ou one end of a shaft, e. The shaft, e, runs in bearings, e 1 , fastened to the top of the 
frame, A, and has a pulley, E 1 , at the other end, which, by means of a belt, e 2 , drives 
a pulley, F, on a shaft, /. The shaft, /, is secured in a central position to the ends of 
a barrel, G, by means of stuffing-boxes, and inside the barrel, G, is provided with a 
number of agitator-arms,/-, for the purpose of stirring the contents of the barrel. 
"The shaft, e, is also provided with an eccentric. H, which operates a pump, I, of ordi- 
nary construction. The supply-pipe, t, of the pump, 1, is adapted to have a hose 
attached to it when water is to be pumped. The discharge-pipe, i 1 , of the pump, 1, 
passes through the barrel, G, near its bottom part, and is closed up at the end with a 
plug, which is removed wliw the pipe is to be cleared. 
"Within the barrel, G, the pipe, is provided with perforations, P, through which 
either air or water, as the caso may be, is forced by the pump, I, into the barrel, G. 
The barrel, G, is provided with an opening in its top part, through which its charge 
in supplied, and which, during the operation of the machine, is closed with a screw- 
plug, (j. The barrel, G, communicates with an air-\essel, J, by means of a pipe, K, 
which has a valve or cock, R, for the purpose of stopping such communication wheu 
desired. 
"The air-vessel, J, has a spring sat'et v-\ ah of common construction, which pre- 
vents the bursting of the barrel, G, and the vessel, J, by too great a pressure of air. 
A cock,/, at the bottom of the vessel, J, serves to let oil' water accidentally deposited 
there. 
"From the bottom of the barrel, G, a pipe, L. conducts the charge of said barrel to 
a distributing-pipe, M, which is provided with a number of small pipes which are 
connected with the nozzles, N, already described. 
" The operation of this machine is as follows: The barrel, G, is filled with the liquid 
either through its upper opening, or while the machine is st at ionary, by throwing the 
belts, D and e 2 , off the pulleys and operating the pump by t urning the shaft, v, by means 
of crank-handles. For this purpose the pump is provided with a hose, at /, for lifting 
the water from a pond or well near by. When the machine is in motion the eccentric, 
H,ou the shaft, c, operates the pump, I, which forces air into the barrel, G, through the 
openings, i 3 ,of the pipe, t 1 . In leaving the openings, P, the air makes it way up through 
the water in the barrel, and produces a continuous and powerful agitation, whereby 
the water is thoroughly combined with its poisonous admixtures. The air is led from 
the barrel, G, through the pipe, K.into the air-vessel, J, from which it exerts its pres- 
sure upon the surface of the water. When a sufficient pressure is obtained the stop- 
cock, O, is opened, whereby the water is forced into the pipes, L, M, and m, and thence 
through the nozzles, X. If the pressure of air withiu the barrel, G, and the air-vessel, 
J, becomes too great, the surplus is let oft" by the safety-valve, j, into the air. At the 
same time the pulley, e" 1 , moves the shaft, /, and the agitator-arms, /*, whereby the 
agitation of the liquid by the air forced through the openings, P, is increased in force." 
V.— SOLID COMPRESSION SQUIRTERS OF POISON. 
In this group is included (1) Rotary force-pumps, (2) Hydraulic bellows, 
(3) Oscillating force-pumps, and (1) Reciprocating force-pumps. 
ROTARY FORCE-PUMPS 
have not yet been made cheap enough to compete with those of group 
No 4. On account of producing a steady or uninterrupted discharge 
