38 



CIRCULAR 3 6 9, U. S. DEPARTMENT OF AGRICULTURE 



Figure 29. — Portion of vacuum fumigator installed in a large candy establish- 

 ment. Note vacuum pump in left foreground ; cylindrical accumulator on 

 tank ; gages for automatically recording pressure, vacuum, and temperature ; 

 and cylinder of the ethylene oxide-carbon dioxide mixture in front of operator. 

 Cylinders of methyl formate-carbon dioxide and methyl bromide-carbon 

 dioxide mixtures are attached in the same manner. 





Figure 30. — New type of rectangular fumigation chamber. Note vacuum pump 

 at right, with temperature and vacuum gages and other equipment behind it. 





