32 



BULLETIN 872, U. S. DEPAKTMENT OF AGRICTJLTUBE. 



12. By beginning the heat process directly after shutting down 

 mill Saturday afternoon and continuing until Sunday night or early 

 Monday, there is no loss in producing hours. 



EXPERIMENTAL DATA ON HEAT FUMIGATION. 



The following temperatures and results were secured in experi- 

 mental work by Dean (mills 1 to 4) and hy Goodwin 5 (mill 5). 



Mill No. 1. 



Brick building; day (July 7-S, 1912) calm, partly cloudy; outdoor maximum 

 temperature 91° F., outdoor minimum temperature 73° F. Heating system, 

 steam pipes along walls, except in space beneath first floor where radiators are 

 used. Steam pressure of about 20 pounds maintained during experiment. Ca- 

 pacity of mills, 600 barrels. 



ON FIKST AND SECOND FLOORS. 



Location and reading of thermometers. — The thermometers were located on 

 these floors as follows : No. 1, in 2 inches of flour in elevator boot on floor, 8 

 feet beneath steam pipes ; No. 2, hanging in middle of room, 5 feet high, 15 feet 

 from steam pipes ; No. 3, in 2 inches of flour in elevator boot on floor. 12 feet 

 from steam pipes; No. 4, hanging in the open, 4 feet high, 15 feet from steam 

 pipes ; No. 5. between the rolls in a roll, 11 feet from steam pipes ; No. 6, hang- 

 ing in the open, 6 feet high, near roll machinery. 



Table I. — Data shotoing rise in temperatures on first and second floors. 



Time of day. 



Julv7 1912: 



10.30 a.m. 



11.30 a.m. 



12.30 p.m. 



2.30 p.m.. 



3.30 p.m.. 



4.30 p.m.. 



5.30 p.m.. 



7p. m 



8.30 p.m. 



9.30 p. m.. 

 July 8, 1912: 



9 a. m 



11 a. m 



12m 



2 p. m 



4 p. m 



5 30 p. m.. 



First floor: Capacity, 28,728 

 cubic feet; radiation, 525 

 square feet. 



Second floor: Capacity. 28,728 

 cubic feet; radiation, 560 

 square feet. 



No. 1. 



100 

 106 

 106 

 106 

 107 

 108 



No. 2. 



F. 

 90 

 94 

 98 

 104 

 106 

 107 

 110 

 110 

 113 

 115 



122 



124 

 125 

 128 

 129 

 129 



Thermometer — 



3. 



No. 4. 



F. 



° F. 



86 



98 



88 



105 



91 



110 



96 



117 



100 



120 



102 



123 



103 



125 



107 



127 



108 



129 



108 



130 



116 



140 



117 



142 



118 



144 



118 



144 



120 



147 



121 



146 



No. 5. No. 6. 



F. 

 97 

 97 

 98 

 100 

 102 

 104 

 105 

 108 

 109 

 111 



122 

 125 

 126 

 127 

 129 

 131 



99 

 106 

 111 

 118 

 121 

 123 

 125 

 127 

 129 

 129 



140 

 142 

 144 

 144 

 147 

 145 



ON THIRD AND FOURTH FLOORS. 



Location and reading of thermometers. — Thermometers were located on these 

 floors ms follows: No. 1, hanging in the open, 5 feet high, 15 feet from steam 





e Op. cit. 



