36 Transactions of the American Institute. 



ticular arrangement. The engine is well adapted for the produc- 

 tion of limited poAver, is simple and easily taken care of. 



ROTARY ENGIXES. 



Ortlieb's Engine, No. 954, is of the type known as the rotary, 

 has one piston, and three sliding pieces so arranged that the steam 

 after performing its work within an inner chamber against the 

 rotating piston, passes to the periphery or outer chamber, where 

 it is expanded, and exerts the pressure due to its volume further 

 upon the piston. 



The object of the combination of its parts, is to produce a 

 balance of pressure upon all the working parts to prevent unequal 

 wear and lateral motion. 



The arrangement for keeping the parts tight, is by means of 

 balanced friction plates. 



The engine is constructed with the view to prevent unequal wear, 

 and remain tight under working pressures, and is the best form of 

 rotary engine known to us. 



But two articles embraced in the list remains to be disposed of. 

 These are turbine water wheels, Nos. 1213 a-nd 231. 



We should have been gratified to have embraced these wheels 

 in the foregoing report, but could learn nothing whatever of their 

 principles of construction or action. 



All of which is respectfully suljmitted. 



WM. W. W. WOOD, ) 



W. W. VANDERBILT, V Judges. 



JAS. F. LEVINESS,* ) 



No. 1292, Wilcox Portable Steam Engine and Boiler, Wilcox 

 Steam Engine Company, Providence, R. I., is a very fine specimen 

 of a small portable steam engine and boiler. The engine com- 

 mends itself for its nice workmanship and completeness, while the 

 boiler is well worthy of notice as a good sample of cast iron boiler, 

 made in sections well fitted up and mounted. 



For parties wishing small power and a very safe, reliable boiler, 

 or for transportation in distant parts of the country where pieces 

 of small weight is an object, this combination is well worthy of a 

 first premium. 



ISAAC V. HOLMES, 



WM. C. SELDEN, ^ Jtulges. 



CHAS. E. EMERY, 



* Approred, with the exception of No. 982. 



