INSECT CONTROL. IN FLOUR MILLS. 



33 



pipes ; No. 2, in flour in a conveyor near floor, 12 feet from steam pipes ; No. 3, 

 in flour in conveyor, 6 feet high, 15 feet from steam pipes ; No.' 4, hanging in the 

 open, 5 feet high, 12 feet from steam pipes ; No. 5, in flour, in a conveyor near 

 floor, 12 feet from steam pipes; No. 6, in flour, in a conveyor near floor, 12 

 feet from steam pipes. 



Table II. — Data showing rise in temperatures on third and fourth floors. 



Time of day. 



Third floor: Capacity, 31,122 

 cubic feet; radiation, 460 

 square feet. 



Fourth floor: Capacity, 43,092 

 cubic feet; radiation, 400 

 square feet. 



Thermometer. 



No. 1. 



No. 2. 



No. 3. 



No. 4. 



No. 5. 



°F. 



°F. 



°F. 



°F. 



85 



89 



96 



88 



88 



91 



100 



90 



91 



95 



105 



92 



100 



102 



114 



99 



102 



103 



116 



101 



105 



107 



118 



103 



107 



108 



119 



106 



111 



111 



120 



109 



113 



113 



121 



111 



114 



114 



122 



112 



126 



125 



127 



118 



127 



125 



129 



119 



127 



126 



132 



120 



128 



128 



133 



121 



128 



131 



138 



124 



129 



131 



138 



124 



No. 6. 



July 7, 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. 



7 p. m 



8.30 p. m. 

 9.30 p.m. 



July 8, 1912: 



9 a. m 



11 a. m 



12m 



2p.m 



4p.m 



5.30 p.m. 



95 

 100 

 105 

 114 

 116 

 119 

 122 

 124 

 126 

 127 



133 

 138 

 139 

 141 

 143 

 145 



91 

 97 

 99 

 101 

 103 

 106 

 109 

 110 



117 

 118 

 119 

 120 

 122 

 122 



RESULTS OF HEATING MILL NO. 1. 



One hundred per cent of all insects were killed on the second, third, and 

 fourth floors. All insects were killed on the first floor, except those in elevator 

 boots on the floor, where killing temperatures were not secured except directly 

 over the radiators in the space beneath the floor. 



Mill No. 2. 



Brick building; day (July 21, 1912) partly cloudy and calm; maximum out- 

 door temperature 97° F. ; minimum outdoor temperature 74° F. Heating sys- 

 tem, steam pipes along wall and a few radiators. Steam pressure of about 100 

 pounds maintained during heating. Capacity of mill, 1,000 barrels. 



BASEMENT AND FIRST FLOOR. 



Location and reading of thermometers. — No. 1, in flour in an elevator boot 

 resting on floor, 5 feet from steam pipes ; No. 2, hanging in the open, 6 feet 

 high, 10 feet from steam pipes; No. 3, in flour in an elevator boot resting 

 on floor, 15 feet from steam pipes ; No. 4, in flour in an elevator boot resting on 

 floor, 10 feet from steam pipes ; No. 5. hanging in the open, 6 feet high, 15 feet 

 from steam pipes ; No. 6, in flour in a roll, 20 feet from steam pipes ; No. 7, in 

 flour in a roll in the cleaning room. 5 feet from a radiator. 



