342 



APPENDIX. 



TABLE IX. 



Experiments on the Cooling Effect of Windows.* 



These experiments were made in a wooden house, double plastered, 

 with a space between the two plasterings ; walls 6 inches thick. Heat 

 introduced from a hot-air furnace, heated air being shut off when the 

 room was heated to a proper temperature. Thermometer four feet from 

 the floor. When the windows were closed, two thicknesses of blankets 

 were fastened closely to the window-frame internally. 



Three windows, equal to 33-21 square feet ; walls, 531 square feet ; 

 cubic contents of room, 1930 feet, being 9 feet high, 16-5 feet long, 13 

 feet wide. 



The room was kept as nearly as possible under the same circum- 

 stances. 



External Internal 

 Thermom. Thermom. 



March 19, 1843. 26 

 25 



o 



74 

 64 



22 74 



18 59 



Weather calm, windows 

 uncovered. 



j Windows covered with 

 blankets. 



March 20. 



March 21. 



25 



24 

 22 



24 



19 



74 



64 



74 



61 



74 

 64 



74 

 64 



h. m. 

 9 1 



10 15 



74 



11 41 

 2 5 



144 



8 8 ( 



9 24 1 Windows uncovered. 



76 



10 17 ( Windows covered with 

 12 22 j ' blankets. 



125 



8 51 



10 19 



88 



11 26 



12 16 



50 



Calm, windows covered. 



Windows uncovered, 

 calm. 



The experiments \rere also made in other rooms, with wooden shut- 

 ters internally. 



The results are as follows : 



1st, room cooled 10 in 74' = 1 in 7-4', windows open. 

 " " 15 C in 144' = 1 in 9-6', windows closed. 



2d, room cooled 10 in 76' = 1 in 7-6', windows open. 



* Wyman OR Ventilation. 



