CATALOG OF THE MECHANICAL COLLECTIONS 59 



The leading dimensions and design data are as follows : 



Boiler heating surface 1-88 sq. ft. 



Condenser surface 1-25 sq. ft. 



Temperature difference assumed between wet and 



dry bulbs 10° F. 



Temperature difference between steam in boiler and 



steam in condenser S^F, 



Difference in steam pressures 1 in. water col. 



Spouting velocity 600 ft. per sec. 



Diameter of nozzle 0.102 in. 



Rate of steam flow 0.004 lb. per hr. 



Horsepower of jet 0.000016. 



Rankine cycle efficiency 1 percent. 



The designer points out that a difference of wet bulb and dry bulb 

 temperature always exists except in "saturated" atmospheres. In 

 homes during winter months and in arid clim.ates the difference may 

 be as much a? 20°. This figure is comparable with the temperature 

 range between sea water at great depths and at the surface, which 

 Claude's deep-sea thermal plant seeks to utilize and upon which vast 

 sums of money have been expended. 



ADDmONAL STEAM ENGINE MATERIAL IN THE COLLECTIONS, NOT DESCRIBED 



Heron's rotary steam engine (aeolipile), model deposited by the U. S. 

 Department of the Interior, 1906. U.S.N.M. no. 244887. 



Papin's steam engine, model, deposited by the U. S. Department of the 

 Interior, 1906. U.S.N.M. no. 244888. 



Solomon de Caus' steam fountain, 1615 ; photographic transparency, made 

 in the Museum, 1926. U.S.N.M. no. 308463. 



Thomas Sarery's steam pumping engine, 1698; photographic transparency; 

 made in the Museum. 1926. U.S.N.M. no. 308467. 



Steam engine, patent model, transferred from the U. S. Patent Office, 1928. 

 Patent issued to G. W. Van Deren, August 14, 1860; Patent no. 29642. 

 U.S.N.M. no. 308863. 



Steam engine, patent model, transferred from the U. S. Patent Office, 1926, 

 not identified. This is a curious form of engine in which the cylinder revolves 

 on the crank and the piston rod is directly connected to the rim of the flywheel. 

 U.S.N.M. no. 308727. 



Marine steam engines ; models, made by Frank A. Wardlaw and presented 

 by Frank A. Wardlaw, Jr. Three finely made small models of a 1-cylinder, a 

 compound, and a triple expansion, vertical reciprocating marine engine. 

 U.S.N.M. no. 310587. 



Steam engine and boiler, model, presented by Walter N. Willi-s. The model 

 represents an engine with a pear-shaped cam on the shaft in lieu of a crank. 

 A patent on this mechanism was issued to the donor, November 20, 18S3> 

 Patent no. 2S8684. U.S.N.M. no. 310625. 



Static pressure turbine element, model, presented by Oscar N. Davis. Tliis- 

 is an experimental demonstrating model of an element of a turbine, whicii 

 was the subject of Patent no. 1952197, issued to the donor. March 27, 193^ 

 U.S.N.M. no. 310824. 



Triple expansion steam engine, model (incomplete), presented by Mrs. R. E^ 

 M. Bain. U.S.N.M. no. 310837. 



