FIFTEENTH ANNUAL YEAR BOOK— PART X 



741 



Fig. 3 7. The Relative Tempera ture.s of Wooden and ]\Ietal Houses Wlien 

 Occupied ; Grapliical Chart. 



siders the relative conductivity of the two materials. In series B we 

 have an average range of 36' Fahrenheit with the metal as compared 

 to 21° for the wooden house, or 71.43% greater range for the metal 

 construction. In series A (smaller houses) we have an average range 

 of 29.2° with the metal as compared to 15.8° for the wooden house, or 

 84.81% greater range for the metal construction. 



It make but little' difference how one makes the comparisons; uni- 

 formly and consistently the metal houses conduct both heat and cold 

 readily. 



The plotted charts in Fig. 37 place squarely on a systematic and 

 understandable basis the daily variations in temperature. They show 

 the temperatures of all houses, as well as the normal atmospheric 

 check, at the hours of 1 a. m., 5 a. m., noon, 5 p. m. and 10 p. m., daily 

 from March 20, 1 a. m., until March 26, noon, 1914. On the heavy middle 

 line is designated the climatic conditions of "sunny" and cloudy." 



The metal house is hotter in the middle of the day and colder at 

 night than the wooden; tracing the plotted lines in both Series A and 

 Series B of the metal and wooden structures forcibly impresses one 

 with the truth of this. 



