AMERICAN INSTITUTE. 



147 



the table: say No. 5, for 20 to 30 horse power; No. 8, for 30 to 

 40 horse power; double No. 8, for 50 to 60 horse power, &c. 



The eores are well faced, and clean out perfectly, and the inte- 

 rior being well washed by allowing a stream of water to flow 

 through it under a head, they have been found, on breaking them 

 open for examination, quite free from sand. 



The tubes being cast on end, there is no danger of blow holes 

 or imperfect places, and being once tested with 200 lbs. per square 

 inch in the water space, they must be as tight and durable as a 

 cast iron kettle. 



Cheap, light, portable, durable, eflicient, easily set in operation, 

 and re<fliiring no care, unless it be to see that they do not freeze 

 up when not in use ; it is thought that they must commend them- 

 selves to universal favor, and find a purchaser in every owner of 

 a steam engine. 



The subjoined table gives in a succinct form, all important 

 dimensions and facts : 



This heater is composed of two symmetrical castings, and has 

 only a single joint, which is so formed and constructed as to be 

 free from all danger of leakage. 



Every heater is tested with a pressure of 200 lbs. per square 

 inch in the water space, and 40 lbs. in the steam space. 



It is designed to heat the feed water of an engine by exhaust 

 steam on the passage, from the force pump to the boiler. The 



