52 
Fig. II. 
The height of the reservoir is 16 inches, its breadth 15 inches, and 
depth 5 inches, 10 pounds of copper being necessary for a tank of 
these dimensions. When filled with the Bordeaux mixture, or any of 
the copper solutions now in use, the machine weighs practically 50 
pounds, which is about as much as a man wishes to carry on his back for 
any length of time. In fact we find very few men able to carry such a 
load constantly for more than a few days at a time. This is why we 
did not make the reservoir larger, as some advised us to do, thinking 
one of 6 gallons’ capacity about the proper size. Where the pumps 
are being used three days out of every fifteen, as is the case with 
many viueyardists, a 6-gallon reservoir would probably not be too 
heavy, but for a man using the machine six days in the week for three 
or four months, as must be done in large nurseries, it is simply out of 
the question. 
holds a little over 4 gallons. We first tried 14-ouuce copper, and found 
it too light, on the other hand 20-ounce seemed to be heavier than was 
necessary, so that we finally adopted the medium grade, which has 
given perfect satisfaction. 
