296 ILLINOIS ACADEMY OF SCIENCE 
ReEcorD OF OuTpoorR AND INDOOR HUMIDITY 
Sunday, December 20, 1914 
Temperature Relative Humidity 1 11:30 8:30 
2m. ai opm, 
Maximum,21°........ Indoor Relative Humidity................... 36% 38% 33% 
Minimum, 4°.......... Outdoor Relative Humidity-........W..... 82% 81%80% 
Average, 12.5°......Average Outdoor Relative Humidity for the Day. 81% 
Calculation 
Absolute humidity of outdoor air at 12.5° and 81% =.710 grains per 
cu. ft. 
An absolute humidity of .710 grains of indoor air at 70°—9%-—rela- 
tive Humidity. 
Monday, December 21, 1914 
Temperature Relative Humidity 7 12 7 
a.m, m. p.m. 
Maximttm, 200.000.0080. Indoor Relative Humidity.......... 35% 34% 32% 
Minimums 0 ee Outdoor Relative Humidity........ 94% 72% 80% 
Average, 12.50, Average Relative Humidity for the Day........ 82% 
Calculation 
Absolute humidity of outdoor air at 12.5° and 82%=.719 grains per 
cu. ft. 
An absolute humidity of .719 grains of indoor air at 70°>9%+ rela- 
tive humidity. 
Tuesday, Decentber 22, 1914 
Temperature Relative Humidity 9 12 3 
a.m. m. p.m. 
Maxamium, 19.0... Indoor Relative Humidity........ 35% 38% 35% 
lingam, OO) gee Outdoor Relative Humidity......77% 64% 58% 
Average\9: 5,0. Wa Ok i Average Relative Humidity for the Day........ 66 % 
Calculation 
Absolute humidity of outdoor air at 9.5° and 66% =.500 grains per 
Cutt: 
An absolute humidity of .500 grains of indoor air at 70°=6.3% rela- 
tive humidity. 
Wednesday, December 23, 1914 
Temperature Relative Humidity 8:40 12:15 (4:30) 17) Sr45 
a.m. | pai. | G2) sp.) pam. 
Maximum, 22°.....Indoor Rel. Humid............... 34% 33% 33% 34% 32% 
Minimum, 5°.......... Outdoor Rel. Humid............. 79% 76% 76% 86% 86% 
Average, 13.5°........ Average Relative Humidity for the Day................. 81% 
Calculation 
Absolute humidity of outdoor air at 13.5° and 81% =.744 grains per 
cu.ft: 
An absolute humidity of .744 grains at 70° of indoor air=9.3% rela- 
tive humidity. 
Thursday, December 24, 1914 
Temperature Relative Humidity 9 10:30 vib} 4 
am. am. p.m. p.m. 
Maximum, 30°........ Tndoot) Rel) Miumaidi 25 40% 40% 45% 35% 
Minimum, 7°........... Outdoor Rel. Humid... 98% 957% 92% 82% 
Average, 18.5°........ Average Relative Humidity for the Day... 92% 
