and the Economy of Fuel. 



79 



Their exact dimensions, measured in English inches, 

 are as follows : 



At the beginning of each of the following experi- 

 ments, each of these boilers contained just 95 measures 

 (or Bavarian maasse) of water, weighing 187 Ibs. Bava- 

 rian weight (equal to 232.58 Ibs. avoirdupois), or a trifle 

 less than 28 gallons. 



The grate on which the fire was made under each of 

 these boilers is circular and concave, and 1 1 inches in 

 diameter ; and their fire-places are in all respects similar 

 to that just described (Experiment No. 1 1). Both boilers 

 are furnished with double covers. 



