CATALOG OF THE MECHANICAL COLLECTIONS 115 



(8) Stirling water-tube boiler, 469 rated horsepower, 450 pounds steam work- 

 ing pressure, with superheater, air preheater, and pulverized coal furnace, for 

 the American Tobacco Co., 1928. 



(9) Stirling water-tube boiler with superheater and slag-tapped pulverized 

 coal furnace, 1929. 



(10) "Marine Boilers", Blasco de Garay, 1.543; Denis Papin, 1707; John Fitch 

 (and Henry Voight) pipe boiler, 1787; James Barlow boiler, 1793; Col. John 

 Stevens "porcupine" boiler, 1804; John Babcock, 1826; Babcock & Wilcox, 

 U. S. S. Munroe boiler, 1876. 



(11) Babcock and Wilcox marine boiler, tested 1895, installed in S. S. Beards- 

 ley, 1901 ; U. S. S. A Icrt type, 1899 ; Shipping Board type with coiled superheater, 

 1918. 



(12) Inclined (18°) tube, cross-drum boiler of the type used on battleships 

 of the U. S. S. Oklahoma and U. S. S. Maryland classes, 1912; Type of boiler of 

 which 12 were installed in S. S. Calif ornia, 1925 (275 pounds working pressure, 

 130° superheater) ; express type, 3-drum, bent, 1-inch-tube boiler for large powers 

 with minimum weight for fast vessels. 



(13) Large marine boiler, with interdeck superheater, air heater, and under- 

 feed stoker, 1926. 



(14) Early type of Great Lakes boiler, installed on S. S. Empire City, with 

 upper deck of 2-iiich tubes in groups of four, lower deck of 4-inch tubes, and 4- 

 inch side-wall tube.s, 1897 ; in.stallation in S. S. City of Saginaic and S. S. City of 

 Flint of typical Great Lakes boiler with chain-grate stoker, 1929. 



BABCOCK AND WILCOX STEAM GENERATOR, 1867 

 Plate 24, Figuke 1 



U.S.N.M. no. 309837; original patent model; transferred from the United States 

 Patent Office ; photograph no. 27158F, 



This model was submitted with the application for the patent issued 

 to George H. Babcock and Stephen Wilcox, Jr., of Providence, R. I., 

 May 28, 1867, no. 65042. 



This boiler is described as one in which the water being converted 

 into steam is held in a number of small containers rather than in one 

 large mass. The advantages that the inventors mention are a com- 

 paratively greater resistance to the expansive force of the steam within 

 the smaller sections, the loosing of a smaller destructive force follow- 

 ing the rupturing of any section, and a greater economy in construc- 

 tion as the design permits the use of cast iron instead of wrought iron. 

 Disadvantages common to boilers of this class, such as deficient circu- 

 lating capacity, difficulty of removing incrustations, and a want of 

 economy in applying heat to the heating surfaces, were said to be elimi- 

 nated in this boiler. 



The model represents a nest of horizontal tubes, which serve as a 

 steam and water reservoir above and connected to a second nest 

 of inclined tubes normally filled with water. The tubes in both 

 nests are arranged in vertical rows, the tubes in each row being 

 connected by means of suitable end tubes, which are cast as 

 part of the individual tubes. The end tubes are held together by 



