.'go BULLETIN 173, U. S. NATIONAL MUSEUM 



with water, due to the pitching of the vessel, would cause the other 

 tubes to supply the steam to the engines and the water would not 

 travel far in the immersed tubes. 



CORLISS WATER-TUBE BOILER, 1879 



U.S.N.M. no. 309214 ; original patent model ; transferred from the United States 

 Patent OflBce ; not illustrated. 



This model was submitted with the application for the patent issued 

 to George H. Corliss, of Providence, R. I., May 27, 1879, no. 215798. 



The model represents a bank of curved water tubes joined in verti- 

 cal rows by the separate cases or tube ends, which are the subject 

 of the patent. Each end of each tube is threaded into the side of the 

 cylindrical casting, which is provided with machined surfaces that 

 allow the separate castings to go together tightly to form a continuous 

 tube sheet or header for each vertical row of tubes. The castings 

 forming each header are held together by a single long bolt, which 

 threads into a casting that forms a common connector along the 

 lower ends of the vertical headers. 



"EVOLUTION OF THE GEORGE H. CORLISS STEAM ENGINE" 

 Plate 18, Figure 2 

 U.S.N.M. no. 310252; 21 blueprints; gift of tlie Franklin Machine Co. 



This is a cloth-bound volume of lithographs of many types of 

 Corliss steam engines, pumps, and engine details. They consist 

 principally of illustrations from sales literature and instruction books 

 published at various times during the existence of the George H. 

 Corliss Engine Works at Providence, R. I. 



CORLISS CENTENNIAL ENGINE, 1876 



Plate 18, Figuee 2 



U.S.N.M. no. 310252 ; 21 blueprints ; gift of the Franklin Machine Co. ; photograph 

 no. 32644F. 



The drawings consist of 21 30-by-42 inch blueprints of the working 

 drawings from which was constructed the 4,000-horsepower Corliss 

 engine that supplied the power to the mechanical exhibits at the Cen- 

 tennial Exposition at Philadelphia in 1876. 



ENGINE GOVERNORS 



LUTTGENS ENGINE GOVERNOR, 1851 



U.S.N.M. no. 251288; original patent model; transferred from the United States 

 Patent Office ; not illustrated. 



This model was submitted with the application for the patent 

 issued to H. A. Luttgens, of New York, N. Y., October 21, 1851, no. 



8447. 



