FROM DIFFERENT APPARATt -. II 



For the purpose of performing these experiments, a slight 

 alteration, only, of the interior room, was required. 



The chimney of the exterior room being situate within 

 twelve inches of the board partition on the east side of the 

 interior room, an opening was made through the partition of a 

 sufficient size fairly to expose the fire-place of the ehimney to 

 the interior room ; the sides, top, and bottom of this aperture 

 were then closed by boards perfectly tight, ami may now be 

 considered as forming part of the interior room. 



All the apparatus, with the exception of the stove, remained 

 the same, and was made use of as has been before described. 



Those constructions of apparatus in most common use, and 

 of proper size for the room were selected. The experiments 

 could not, without great inconvenience, be extended so as to 

 embrace all the inventions which have been presented to tin 

 public as improvements upon these constructions, but it is be- 

 lieved those selected will be sufficient for the object of th» 

 inquiry. 



This course of experiments was conducted on the same plan 

 as the former, namely, by determining the period of ntffft 

 which the air of the interior room could be maintained 10" 

 of temperature above that of the exterior room, in the combus- 

 tion of equal quantities of fuel, by weight, in each apparatus. 

 In some cases, indeed, it was necessary to use larger quantities 

 of fuel than in others, in order to make satisfactory experiments, 

 yet the results arc given for equal weights, and exhibit flit 

 tune which the air of the room was thus maintained by each 

 apparatus, and are compared with the time which the saint 

 Weight and kind of fuel had maintained the same differ* ne« 

 of temperature in using apparatus No. M. in the former slat. 

 of the room; a correction having been made for the slight in- 

 crease in it> size, in consequence of the alteration which lia- 

 been described. The fuel used in all the experiments \\a« 

 shell-bark hickory wood, of the same quality, and absolutely 

 dry. 



It had been apprehended that considerable difficulty would 

 be experienced in producing the required equality in the ten 



VOL. III. 1. 



