Report of Superintendent. 77 



steam. Revolutions. 



Harris T4 60 



Harris TO 60 



Harris 65 60 



Harris 62.5 60 



Hai-ris 59 60 



Harris 56 59 



Harris 53.5 59 



Harris 48.5 58 



Harris 45 58 



Harris 42 ' 58 



Harris 38 58 



Harris 34 57 



Harris 31.5 53 



Harris 28 50 



There were two other engines in competition in addition to those 

 mentioned, viz. : A vertical engine built at the Albany St. Iron 

 Works, of New York, and having the Rider valve, and a Hicks engine 

 of the new pattern. From the want of time, it was not possible to 

 properly test these engines. 



Eespectfully submitted. 

 (Signed) CHARLES E. EMERY, 



General Sujperintendent of Exhibition. 



To the Managers of the American Institute Exhilition : 



Gentlemen. — In accordance with the- facts reported by the super- 

 intendent and observed by ourselves, we have come to the following 

 conclusions (embodied in our report of December 3d, 1869), respect- 

 ing the relative merits of the engines in question : 



51. Harris Steam Engine {Corliss). First Medal and Diploma. 



Eor best results on net effective power shown at the trial, being 

 from one to two per cent better than any other in competition ; and 

 for superiority of workmanship and general arrangement of valves, 

 and valve gearing. 



848. Balcock & Wilcox Steam Engine, First Medal and Diploma. 



For the most perfect automatic expansion valve gearing on exhi- 

 bition. 



The judges are of the opinion that, had the principles upon which 



