!58 



IOWA DEPARTMENT OF AGRICULTURE 



pearance is about 140° F. Continue the heating until the tempera- 

 ture of the steam at the end of the outlet pipe is at least 205° F. ; 

 this should be determined by a thermometer. When the steam has 

 reached this temperature, place the can inverted over the steam out- 

 let, as shown in figure 5, for five minutes, then remove, shake out 

 any water, and place upright on the floor. The can should be abso- 

 lutely dry in one or two minutes. If not dry in that time it shows 

 that the steam was not 205° F. or above, or that the can had not been 

 washed clean. On account of being so highly heated by the steam 

 the can should dry almost immediately. 



In figure 6 an insulating cover is shown over the can. A similar 

 cover can be made cheaply from a blanket, and its use is urged, espe- 

 cially in cold rooms, since otherwise the can may be cooled so quickly 

 that it will not dry thoroughly. 



