166 Agktcultural Expekiment Station, Ithaca, N, T. 



upper return in the south side of the house near southwest corner; No. 



7 just below it in the lower return . 



Three series of general comparisons were made between hot water 



and steam. From December 29th to January 16th, the apparatus was 



used for hot water; from January 16th to February 10th, it was used 



for steam, February 10th to 23d, hot water; February 24th to March 



13th for steam. March 16th to 24th for steam; March 25th to April 



1st for hot water. The last couplet concerns the comparative tests on 



the length of the run as influencing the behavior of steam and 



hot water, 



Goiinparison of out-door and in-door temperahires. 



HOT WATER. 



Dec. 29 to Mar. 25 to 



Jan. 16. Feb. 10-23. April 1. 



Average minimum night temperature indoors 48 15-16 50 3-11 53 1-3 



" " " outdoors... 8 1-12 19 3-11 28 2-3 



Difference 40 41-48 31 23 2-8 



STEAM. 



Jan. 16 to Feb. 24 to Mar. 16 to 

 Feb. 10. Mar. 13. Mar. 24. 



Average minimum night temperature 



indoors 46 11-17 515-7 47 



Average minimum night temperature 



outdoors 16 10-17 22 3-7 25 4-7 



Difference 30 1-17 29 3-7 22 8-7 



This table shows a slightly greater efficiency of hot water in main- 

 taining a difference between the minimum night temperature outside 

 and in the house. It will be noticed that the greatest difference occurs 

 in the first hot water test. This was during very cold weather, the 

 outside temperature being frequently below zero, and these were the 

 mornings which naturally showed the greatest difference between the 

 outside and house temperature; so that all of this greater difference 

 can not justly be attributed to the geater efficiency of the hot water 

 heating. 



Coal consumption. — The coal used during the test was anthracite, 

 Qgg size, all of which was weighed as used; the following table shows 

 the amount used each da^'^ throughout the season. 



