34 ' THE HOP APHIS IX THE PACIFIC REGION . 
which I filed on the 20th day of March. 1909, an application for patent of the United 
States, serial No. 484784; and 
Whereas, it is my desire that the public generally shall have the right to use said 
invention, 
Xow, therefore, I. the said Theodor Eder, hereby dedicate, grant and convey to the 
public at large and to whomsoever may desire to use said invention, the full right, 
liberty and license to make, use and sell apparatus embodying the said invention for 
the full end of the term of any letters patent which may be granted on said application. 
And I hereby authorize and request the Commissioner of Patents to issue any letters 
patent which may be granted on said application to the people of the United States 
and Territories thereof as the assignee of my entire right, title, and interests in and to 
the same. 
In witness whereof. I have hereunto set my hand and seal this 31st da}- of October, 
A. D. 1912. 
Theo. Eder. 
This spraying machine (PI. IX, fig. 1) is composed of a large iron 
tank, fitted with a pressure gauge (1), an inlet pipe with a strong 
screw cap (2) which is opened with a large wrench (3), an outlet pipe 
with cut-off (4) and connected through a pressure-reducing valve (J) 
with a large air bottle (6). (A large carbonic-acid gas bottle serves 
this purpose, the larger the better.) This machine is fastened onto 
a truck made from two old mower wheels and an iron shoe. 
Provided that the spray material is thoroughly screened so that 
no dirt gets in to clog the nozzles, this machine is effective and is so 
small and light that it is readily hauled through a hopyard by one 
horse. 
The air bottles are filled with air compressed by the air compress, 
to 1,000 or 1.200 pounds (PL IX, fig. 2), loaded onto the supply wagon, 
and hauled with the spray to the field. The spray tank is filled, an 
air bottle connected with the reducing valve which has been set for 
120 or more pounds pressure, the air is turned on, the pressure gauge 
indicates the pressure that is maintained, and the machine is ready 
for work. 
The following information was received from Mr. Eder and gives 
data from which the cost of such a machine may be estimated : 
Replying to your request in this regard, we beg to advise that the cost of these rigs 
depends upon the size of the spray tank, etc. A 150-gallon tank in black iron would 
cost about $42. The reducing valves which we use between the ah bottles and the 
tank cost $10, including pressure gauges and fittings. Mowing machine wheels we 
buy old, costing from $1 to $1.50 per pah. The axles and other iron work on the truck 
cost in the neighborhood of $8, and the woodwork, etc.. would probably bring the 
entire truck construction up to $15. The only things you would now have to add are 
spray hose, pipe, and nozzles, which expense would, of course, vary according to the 
number of leads and the length of same. We usually use four leads, two of 16 feet and 
two of 25 feet. We use seven-ply ^-inch hose, costing about 12 cents per foot, and use 
10 feet of +-inch pipe for spray rod to each lead, and a hop nozzle, which costs approxi- 
mately 90 cents. The value of the pipe and valve would probably be SI. The air 
bottles, if purchased in lots, cost $12; singly, probably $15. 
For further information we beg to advise that a crew of four spray hands will empty 
a 250-gallon spray tank on hops about five to six times a day, and this would require 
