1839.] 



THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 



2^2 



BUNNETT AND CORPE'S PATENT CONCENTRIC STEAM ENGINE. 



The following tables, deduced from iiccurate Experiments, made with a view of ascertaining the relative advantages of the application of 

 power, by "Bunnett and Corpe's" Patent Concentric Steam Engine, in comparison with the present Locomotive and other Engines, shows the 

 amount of force necessary to move a crank (having a nine-inch throw) through one complete revolution :— 



Fig. 1. shores the position of flie 

 coniiecting-riid, as applied di- 

 rect from the ciicular piston- 

 rod in Bunnett and Corpe's 

 Patent Concentric Knyine. ii.h, 

 are points between tthicli the 

 end of connecting-rod recipro- 

 cates. 



c, d, are points between w hieli the 

 piston reciprocates. 



e, is tlie position of the end of 

 connecting-rod. w lien the crank 

 is :it an angle of 4.5 degrees. 



/, is the position of the piston. 



k-C 



Fig. 2, shows the position of the 



connecting-rod, as applied from 



the present horizontal cylinders. 

 (I, II, are guides through hIiIcIi 



the piston-rod is worked freely; 



forming its jjarallel motion. 

 b, represents the connecting-rod, 



when the crank is at an angle 



of 45 degrees, 

 f , end uf ctiunectiiig-rod attached 



to the piston-rod by a joint, 



working freely. 



a 



I 



a 



Fig. 2. 



