UNCONSDMED COAL IN ASHES. 



As far as we could determine by close examination and weighing, 

 there was about the same proportion of unconsumed coal as of that 

 consumed in the ashes from each boiler. 



The following table shows the record of the week ending Feb. 26. 



*These two are the only days of the whole month in which tlie amount of coal consumed 

 in the steam boiler was materially less than that consumed in the hot water boiler, and 

 any other week would show much more marked difference in favor of the latter. 



RESULTS. 



It will be seen by the foregoing tables that the hot water boiler 

 consumed 720 lbs. less coal than the steam boiler in February, and 

 688 lbs. less in January, a saving of nearly 20 per cent. 



At the same time the temperature of the room heated by hot water 

 averaged 1.7*^ higher than that heated by steam. 



The temperature was more even where heated by hot water, and 

 consequently there was less danger from sudden cold weather. This 

 was strikingly shown on the night of February 22d. 



The average outside temperature for the day was 34*^. 



At 9 p. M. it was above 32° and proper precautions not having been 

 taken for so sudden a change as followed, at 6 o'clock on the morn- 

 ing of the 23d, the temperature of the room heated by steam was 29", 

 while in that heated by hot water it was 35°. 



CONCLUSION. 



While this test is conclusive for the two boilers employed in these 

 two houses as constructed and for this unusual winter, in a larger 

 house and in a winter where the temperature runs lower and with 

 greater extremes, different results might possibly be obtained, but 



