70 Farmers’ Bulletin 1220. 
conducted into the spray tank below. By the side of each of these 
dilution tanks a 50-gallon barrel, one containing stock solution of 
bluestone and the other stock milk of lime, should be placed. Each 
gallon of stock solution should contain 1 pound of bluestone or J 
pound of lime. 
To make 200 gallons of Bordeaux mixture, 4-38-50 formula, with a 
mixing plant of this type, dip out 12 gallons of well-stirred stock 
milk of lime and pour into the lime dilution barrel or tank and pour 
16 gallons of stock bluestone solution into the bluestone tank. 
Then fill each of these tanks to the 100- 
gallon mark by running in water from the 
storage tank above or whatever the most 
convenient source of water supply may be. 
The stopcocks of the dilution tanks may be 
opened then so that the diluted lime and 
bluestone may run together through the dis- 
charge pipe and into the spray tank, the 
opening of which should be covered by a 
good brass wire strainer in order to remove 
any sediment or dirt present and avoid clog- 
ging of the spray nozzles. If more con- 
venient, water may be pumped directly into 
the sprayer tank until it is three-fourths 
full. Then add the stock solution of blue- 
stone, after which the stock lime may be 
added, diluting as necessary to make it pass 
through the strainer and fill the sprayer 
tank. While the lime is being added the 
agitator should be kept running in order to 
insure thorough mixing of the ingredients. 
If thoroughly agitated, a Bordeaux mixture made in this way is en- 
tirely satisfactory. 
Fie. 73.—Bucket spray pump. 
NEUTRAL COPPER ACETATE. 
Neutral copper acetate, or basic copper acetate, dissolved at the 
rate of 1 pound to 50 gallons of water, has been found to be the best 
nonstaining preparation for use on grapes when nearly mature. 
SPRAYERS. 
BUCKET PUMPS. 
Bucket pumps (fig. 783) are convenient for spraying small gardens 
and shrubs or a few small trees. They should be made of brass or 
other noncorrosive metal and preferably equipped with an agitator. 
In some of these pumps agitation is provided by means of a small 
jet of liquid that is forced from the bottom of the pump through 
