14- 



CIRCULAR 3 7 3, U. S. DEPARTMENT OF AGRICULTURE 



supply, and water at 140° to 180° F. was circulated through the coils. 

 The size of the evaporation system needed depends on the size of 

 the house and on the quantity of carbon disulphide to be used. In- 

 formation on the amount of coil surface and length of copper tubing- 

 required for vaporizing different quantities of carbon disulphide is 

 given by Weigel. Young, and Swenson (9). There must be a suffi- 



Figurk 11. — Hot-water heater and circulation pump used to heat the coil in the evap- 

 orating pan at the fumigating plant at llammonton, N. J. 



of the gas in the 



cient number of fans to insure complete circulation 

 room. 



A hot- water heating system may be installed outside the fumi- 

 gating room to maintain the temperature at 80° F. if it is de- 

 sired to fumigate when the outside temperature is below that point. 

 The hot water mav be circulated bv an electric motor and automat- 





