AN [MPROVED SYSTEM. 
61 
Very few metals will withstand sulphuric acid without corroding 
For this reason all the common types of faucets are practically 
worthless for drawing acid. There is 
no faucet on the market thai is alto- 
gether satisfactory for this purpose, 
although at the present time a manu- 
facturing firm on the Pacific coast is 
experimenting in the hope of perfect- 
ing the necessary article. We have 
mei this difficulty in an entirely prac- 
tical manner by attaching a three- 
quarter inch iron pipe to the lower 
side of the jar and regulating the flow 
of acid by means of a large pinchcock 
placed on a short piece of rubber tub- 
ing at the end of the pipe (fig. 2 1. 1,-1. 
and 5). The How of acid is rapid and 
easy to control. Pure rubber is most 
satisfactory and a fresh piece should 
be substituted about every other night . 
The water is drawn from a faucet. 
In order that this may he drawn on 
the same side of the cart as the acid, 
a pipe of the character shown in figure 
23 is required. The faucet should 
have an opening of about three-fourths 
inch to allow a heavy flow and should be of such a type that a half 
turn will give it a full opening. 
As fumigation is usually conducted at night a torch is placed on 
the front of the cart to furnish a light by which to measure the acid 
and water; one on the elevated platform is convenient for the man 
measuring the cyanid. 
This style of cart is entirely practicable for almost all fumigation 
work. The chemicals can be measured quickly and accurately with- 
out any slopping of acid or water. The work is also easier on the 
men in charge than under the old system. On ground which is so 
rough that a wheeled cart can not be drawn, a portable table may 
be used. Such a table as is shown in figure 25 can be easily utilized 
for such a purpose. 
PROCEDURE. 
Five men are required to operate this system to advantage. Two 
men pull the tents and kick in the edges around the bottom of the 
tree. One man takes the measurements of the tree and determines the 
dosage from a dosage schedule which he carries with him. After de- 
termining the dosage he should empty the generator to be used for 
that tree and have it in readiness bv the time the cart arrives. The 
Fig. 24. Earthenware ai I ! jar with attach' 
ments for field use: t, Jar complete; /.in- 
side view of lead-lined caver showing tube 
at (enter; 8, copper top for opening In 
cover; .;, pinchcock; .",, method of attach- 
ing iron pipe to jar, and rubber tube on end 
of pipe with pinchcock attached. 
