112 BULLETIN 173, U. S. NATIONAL MUSEUM 



The model represents a sectional marine water-tube boiler in which 

 the proportions of the elements and the manner of their connections 

 are designed by the inventor to facilitate the removal of tubes or 

 sections within a relatively small space. 



The boiler is constructed of sections, each of which consists of a 

 vertical tube at the back of the boiler from which projects a vertical 

 row of horizontal tubes. Each horizontal tube is closed at the front 

 end with a screw plug through which a short central tube connects 

 to a small vertical tube, common to all the horizontal tubes of a 

 vertical row. These vertical tubes at the front are closed at the 

 bottom end and are joined by a transverse steam pipe at the top. 

 The horizontal tubes are staggered and may be withdrawn hori- 

 zontally by disconnecting them from the tAvo vertical tubes at front 

 and back. Each horizontal tube has an internal tube designed to 

 improve the circulation. The back vertical tubes are flat-sided and 

 placed together to form the back of the boiler. The horizontal tubes 

 in the outside sections are assembled close together to form the sides 

 of the boiler. 



RITTY STEAM BOILER, 1875 



U.S.N.M. no. 309215 ; original patent model ; transferred from the United States 

 Patent Office; not illustrated. 



This model was submitted with the application for the patent 

 issued to Sebastian Ritty, of Dayton, Ohio, July 22, 1873, no. 141172. 



The model represents a horizontal cylindrical flue boiler from the 

 center of which is suspended a rectangular water chamber or header. 

 From this header a series of horizontal closed-end water tubes ex- 

 tend forward and back within the furnace below the drum. The 

 outside ends of the tubes are closed and are supported in sheets, 

 which form the front and back walls of the furnace. The forward 

 lower tubes support the grates, and the products of combustion pass 

 through an opening in the central header around the back tubes up 

 and then forward through the flues of the drum. 



FIRMENICH AND STIKER BOILER, 1875 



U.S.N.M. no. 309213 ; original patent model ; transferred from the United States 

 Patent Office ; not illustrated. 



This model was submitted with the application for the patent 

 issued to Joseph Firmenich and Flavins P. Stiker, of Buffalo, N. Y., 

 November 16, 1875, no. 169977. 



The model represents a boiler made up of sections, each of which 

 consists of two longitudinal horizontal drums, one set in the under 

 side of the brick work at the top of the boiler, the other well below 

 it, and the two connected by two rows of vertical tubes. The lower 

 -drums in alternate section are below the grates and act as mud drums ; 



