Ill 



I 



COMBINATION OF OIL EMULSION WITH OTHER MATERIALS 



For practical reasons, it is desirable that a spray may be mixed with 

 as many other spray materials as is possible. Obviously, it is highly 

 desirable that Bordeaux mixture, a fungicide, should be one of the com- 

 patible sprays. As already indicated, any substance that will go into the 

 interface and increase the viscosit)' will cause emulsification, and the 

 basic sulfate which is precipitated when lime and copper sulfate are 

 poured together, does exactly this thing. The small particles of the pre- 

 cipitate have only a slight tendency to unite with one another and are 

 more readily wetted by the water than by the oil ; hence they surround 

 the oil globules in the spray solution, thus aiding the soap in holding 

 them in suspension. 



Pickering, in IflOT, discovered that oil could be emulsified with 

 Bordeaux mixture. Some of his work was therefore duplicated in 1922 

 in our laboratory, and the product tried out in the field the following 

 year. 



Since such a combination is theoretically and practically sound, 

 an oil emulsion made by the formula, one gallon paraffin oil, 90 vis- 

 cosity, one-fourth gallon of water, and two pounds of potash-fish-oil 

 soap, was used at varying strengths with Bordeaux mixture at strengths 

 of 3-9-50, 9-3-50, and 4-4-50. The results are shown in Table V. 



This shows no decrease in the effectiveness of the lubricating oil 

 emulsion as a scalecide when combined with Bordeaux mixture. 



The emulsion was also combined with lead arsenate (basic lead) 

 at the rate of one pound to fifty gallons of diluted emulsion. The re- 

 sults are shown in Table VI. 



