REMARKS. 



The foUowiug criticisms have been made by parties not conversair. 

 with the facts of the case : 



1st. That the piping and ciieck valve were not arranged so as to 

 get the most perfect circulation of steam without a great loss of fuel. 



2d. That the flues from the two boilers entered the chimney in 

 such a way as to give a better draft to the hot water boiler. 



3d. That the exposure of the two houses was such that the house 

 heated by hot water received more sun-heat than the one heated by 

 steam. 



These criticisms we think we can answer to the entire satisfaction 

 of all fair-minded readers. 



PIPING AND CHECK VALVE. 



By numerous test examinations we have found that the circulation 

 of steam through all the pipes, above the water line of the boiler, is 

 perfect whenever there is fire enough to create steam in the boiler, — 

 that the check valve must consequently work easily and that there is 

 never any standing water in the return pipes above the water line of 

 the boiler. 



FLUES. 



The flues are arranged so as to give as nearly equal draft to the 

 boilers as is possible and have them enter the same chimney and 

 enter at the same point, and if there is any difference in the draft of 

 the two it is in favor of the steam boiler. 



EXPOSURE TO SUN-HEAT. 



It was suggested by the late Mr. Geo, Hills of Arlington, that, 

 perhaps, from their location, the steam-heated house received less 

 sun-heat than that heated by hot water. 



To test this matter two standard thermometers were placed in each 

 house so that the sun's rays should fall upon them equally in both 

 houses at the same time, one on the eastern and one on the western 

 exposure. 



Records were made three times each day for twenty days, ending 

 March 18th, the results of which are shown in the following table. 



