102 BULLETIN 173, U. S. NATIONAL MUSEUM 



or black lead, is used to protect the walls of the generator and the 

 engine from the action of the carbon-disulphide vapor. Steam and 

 hot water from the water jacket of the generator are led into passages 

 surrounding the engine cylinder and connecting pipes to prevent the 

 loss of heat from the vapor. 



KIMMAN COMPRESSED-AIR ENGINE 

 U.S.N.M. no. 310189 ; original ; gift of Martin T. Kimman ; not illustrated. 



This small, 3-cylinder, radial, air engine was designed and made 

 by Henry James Kimman (1862-1921), a pioneer inventor of small 

 portable piston air drills. It is believed that the engine was built 

 for a steering engine on a steam roller. The experience gained in 

 the construction of the engine directed his interest to the design of 

 air drills, in which field he made valuable contributions. 



The engine is exhibited in the Museum with several forms of the 

 Kimman air drill not described in this publication. 



MECHANICAL TRANSMISSION OF POWER 



The mechanical transmission of power, though a large subject and 

 an important phase of mechanical engineering, is not largely repre- 

 sented in the National Museum collections. A few models of ele- 

 mentary belt drives are included in the group described above under 

 "Models of Mechanical Powers" (p. 3) and the remaining items in 

 the collection are listed here. 



BELT DRIVING ACCESSORIES (chronologically arranged) 



Belt fastener, Patent Office model, Patent no. 25187, issued to Albert Ficket>., 

 August 23, 1859. U.S.N.M. no. 309148. 



Splicing belts, Patent Office model, Patent no. 66261, issued to N. E. Smith 

 July 2, 1867. U.S.N.M. no. 309154. 



Belt lacing. Patent Office model. Patent no. 70775, issued to H. C. Babcock, 

 November 12, 1867. U.S.N.M. no. 309153. 



Belt hook. Patent Office model. Patent no. 84968, issued to Charles Sargeant, 

 December 15. 1868. U.S.N.M. no. 309143. 



Splicing or joining belts. Patent Office model, Patent no. 86123, issued to 

 John Ashworth, January 26, 1869. U.S.N.M. no. 309155. 



Belt .ioints, Patent Office model. Patent no. 89820, issued to B. P. Walker, 

 May 4, 1869. U.S.N.M. no. 309146. 



Method of lacing belts. Patent Office model. Patent no. 153153, issued to George 

 :E. Burt, July 21, 1874. U.S.N.M. no. 309150. 



Belt fastener, I'afent Office model. Patent no. 164855, issued to J. B. McBlroy, 

 June 22, 1875. U.S.N.M. no. 309156. 



Belt tightener, Paleiit Office model, Patent no. 196222, issued to Gilbert Greene, 

 October 16, 1877. U.S.N.M. no. 309139. 



Belt tightener. Patent Office model. Patent no. 201596, issued to David L. Croft. 

 March 26, 1878. U.S.N.M. no. 309157. 



Belt tightener. Patent Office model, Patent no. 226311, issued to V. H. Hallock, 

 April 6. 1880. U.S.N.M. no. 309147. 



