February, '13] 



HEAT FOR MILL INSECTS, DISCUSSION 



53 



Location of Thermometers 



No. 1. Hanging in open 5 feet high, 26 feet from steam pipes. 



No. 2. Hanging in open 5 feet high, 28 feet from steam pipes. 



No. 3. In flour in elevator boot 6 inches from floor, 24 feet from steam pipes. 



No. 4. In flour in conveyor near floor, 13 feet from steam pipes. 



No. 5. In flour in conveyor iiear floor, 22 feet from steam pipes. 



Result: One hundred per cent of the insects were killed. 



Deck (or fifth floor) 

 Capacity included in measurement of fourth floor. Amount of radiation none. 



READING OP THERMOMETERS 



Location of Thermometers 



No. 1. Hanging in open 5 feet from floor. 



No. 2. In flour in conveyor near floor. 



Results: One hundred per cent of the insects were killed. 



President W. D. Hunter: Is there any discussion on this paper? 



Mr. F. L. Washburn : Mr. Dean states the matter correctly when 

 he says that hydrocyanic acid gas does not penetrate well. In spite 

 of this, however, it seems to be a very good remedy, although it is 

 not perfect. I would like to ask Mr. Dean the cost of piping an av- 

 erage sized mill. 



Mr. G. a. Dean: In case the mill is using steam power and there 

 is no steam radiation in the mill, it would cost in a 1,000-barrel mill 

 from $500 to $600 to install a good heating system. The installation 

 can be done by the mill men. There should be sufficient radiation to 

 heat the mill to a temperature of 70 degrees during winter weather. 



Mr. F. L. Washburn : Don't you think that the average millman 

 would "object to spending that much money? 



Mr. G. a. Dean: Inasmuch as a mill with a capacity of from 600 

 to 1,000 barrels will have on an average more than $100,000 capital 



