February, '13] 



DEAN: HEAT FOR MILL INSECTS 



45 



with hydrocyanic acid gas, but in no case has the fumigation with gas 

 proven so successful as the heating of several mills. In the heating 

 • of these mills it has been demonstrated that the heat is the most prac- 

 tical, efficient, convenient and least expensive method. To fumigate 

 with hydrocyanic acid gas requires from two to three days, and this 

 long shut down with the additional cost of material is a large item of 

 expense, besides an element of danger to the operator, while with heat, 

 since it can be applied from Saturday evening until Monday morning, 

 there is no loss of time, very little expense, and no danger to the life 

 of the operator. 



TEMPERATURE RECORDS AND OTHER DATA OF SOME MILLS THAT 

 HAVE USED HEAT SUCCESSFULLY 



R. E. Kidder Flour Mills, Kansas City, Kansas 



Capacity of mills, 600 barrels. 

 Building, brick. 



Date of heating, July 7-8, 1912. 

 Character of day, partly cloudy and calm. 

 Outside maximum temperature, 91 degrees. 

 Outside minimum temperature, 73 degrees. 



Heating system, steam pipes along the wall, except in space beneath the first floor 

 where radiators are used. 



Steam pressure maintained during the heating, about 20 pounds. 



First Floor 

 Capacity of floor, 28,728 cu. ft. Amount of radiation 525 sq. ft. 



BB.'^DING OF THERMOMETERS 



