AND QTHER BUILDINGS 163 



is now easy to determine the amount of acid and water, 

 as a half more acid, liquid measure, than cyanide, and 

 a half more water than acid are used; thus: 53-1-2 

 = 26.5, which, added to 53, equals 79.5 ounces of acid, 

 or practically 5 pounds, liquid measure. Again, 79.5, 

 or practically 80, as we usually discard fractions, 

 divided by 2 equals 40, which added to 80 makes 120 

 ounces of water. 



Therefore, a room 20 x 30 x 10 feet requires 53 

 ounces, by weight, of cyanide, 80 ounces, liquid 

 measure, sulphuric acid, and 120 ounces, liquid meas- 

 ure, water. The total cost of chemicals will be about 



$1-25- 



Application. The methods used for generating the 

 gas in large enclosures, such as a mill or other building, 

 is not unlike that illustrated in Fig. 70, Chapter XIV. 

 In our early experimental work it was thought desir- 

 able to weigh the cyanide in bags of one pound each, 

 but more recent practical tests have shown that 

 it is more economical and satisfactory to have it 

 weighed out in packages of three pounds each. Where 

 used in this manner the jars or wooden vessels for 

 acid and water should hold two or three gallons 

 each. 



If, for example, we had a room in which 18 

 pounds of cyanide were required, it would be weighed 

 out in six packages of three pounds each. Each 

 package will require a separate generator; therefore, 

 six crocks or wooden vessels will be necessary. They 

 should be arranged at various places in the room. 

 Strings should be arranged so as to hang directly 

 over each vessel, and carried through screw-eyes in 



