16 



but if a number of lots are required, the materials can be kept in stock solution 

 (see p. 17) and simply transferred by dipping. In preparing very small quantities 

 of Bordeaux mixture, buckets or similar vessels may be substituted for the half- 

 barrel tubs. It is possible for a single operator to dip a bucketful of the bluestone 



solution and then a bucket- 

 ful of milk of lime and 

 pour them together into a 

 vessel. It is usually pref- 

 erable to have a bucketful 

 or so of water in the re- 

 ceptacle into which the 

 solutions are to be poured, 

 but this is not essential. 



The better and quicker 

 way of making up Bor- 

 deaux mixture by the bar- 

 rel consists in placing the 

 two half-barrel tubs on 

 an elevated platform and 

 then, by means of hose or 

 spigots, allowing the two 

 is more fully described 



Fig. 3.— Men pouring together milk of lime and bluestone to make 

 Bordeaux mixture. 



-No matter what quantity of mixture is to be made 

 the materials through a wire strainer. The best 

 18 or 20 meshes to the inch. If all 



solutions to flow together into a barrel. This method 

 farther on. 



Stra.ining- the materials, 

 up, it is necessary to strain 

 type of strainer is made of brass wire with 

 the copper solution is strained and _ 

 then the milk of lime is strained into 

 the dilution vessels, it will not be 

 necessary to strain the Bordeaux 

 mixture, as, on account of its floccu- 

 lent character, it is sometimes more 

 diflicult to pass through the strainer 

 than the lime milk. Some very good 

 strainers made of copper are on the 

 market and may be obtained from 

 the makers of spray pumps. One of 

 the best, which can be made at home, 

 is in the form of a box about a foot 

 square (fig. 4), the bottom of which 

 is a rather heavy board (preferably 

 of hard wood), with a hole bored 

 through it, into which a piece of gas 

 pipe IJ to 2 inches in diameter and 

 8 to 12 inches long is fitted. The box is of course open at the top. Fitting just 

 inside this box is a second and lighter box, also open at the top, and having an 

 overhanging strip nailed around the top which supports it. The bottom of this 

 inner box should be made so as to slope at an angle of about 30°, and should be 

 made of wire screen. The slanting bottom makes it harder to clog with the spray, 

 and the inner box, being movable, can be inverted and washed in a tub of water, 



247 



Fig. 4. 



Cross section of strainer for Bordeaux 

 mixture. 



