12 



N. H. Agricultural Experiment Station [Bulletin 303 



FEB. II&I2 



OUTSIDE AIR 



-8'^ 



■22*- 



FEB.I2&I3 



OUTSIDE AIR 

 ►K* 



AIR IN HOUSE 

 lO"* 



AIR IN HOUSE 

 20» 



NO. 13 



NOI4( V 



NO. 1 5 



^T??77^7777k; 



'~ r ' ■ ■ ,; ■■—- J ?-*• >-■*-■• ■ - T-— ^^:i— 



35*-^ 



WOOD 



-3' 



--3 2* 



Fig. 5. The kinds of floors used in the experiment and 

 thermocouple readings taken at the upper and lower 

 surfaces on two representative days of average cold 

 weather. The differentials between these are indi- 

 cated by figures between arrows. The curve to the 

 right indicates that about 1" of insulation produces a 

 n,oticeable effect on temperature regulation. 



which lies directly under the brooder, and (2) that part of the floor 

 which lies outside of the brooder area. The two parts are exposed to 

 much different conditions, and the following data refer to only the first 

 mentioned floor area, that directly under the brooder. 



The average temperatures on top of the floor and under the floor 

 are shown in their relative positions. The figures inserted in the ar- 

 rows are the temperature differences between the points at ends of the 

 arrows. The outside temperature on the first night averaged — 8 de- 



