WATER TU15E BOILERS. 



605 



their opportunity, since they do not give a more distinct description 

 than this. 



During the ten years following this great progress was made 

 in American engineering; and during this decade the wat(,'r tube 

 boiler was evolved in the forms that have since enabled it to drive 

 all other boilers almost entirely from the market in that country, so 

 far as stationary work is concerned. 



The following table is the result of trials at the C!entennial Exhi- 

 bition of 1877 : — 



Table continued. 



