PLANS AND SECTIONS. 



The principal parts will be recognised by the preceding general 

 description, and the following references : 



The steam cylinders 



The steam pistons .... 

 The piston-rods . . 

 The connecting-rods .... 

 The cranks driven by them which in this case are 

 constructed on the axle of the driving-wheels 

 The driving-wheels .... 



The supporting-wheels 



The passages to allow the entrance and escape of 



the steam to and from the cylinder . 

 The case containing the slide by which these 



passages are opened and closed . 

 Two pair of eccentrics by which the slides are 

 moved, one governing the steam so as 



move the engine forward, and the other so as 

 to move it backward 

 The rods by which these eccentrics act upon those 



of the slides ... 

 The handle or lever by which the engine driver 



throws one or other pair of eccentrics into 



connexion with the slides 

 The steam -chest, where dry steam free from mixture 



with aqueous spray is received from the boiler 

 The steam-pipe leading from this chest by which 



steam flows to the slides and to the cylinder 

 The blast-pipe, by which steam, after entering the 



piston, is discharged in puffs up the smoke- 

 funnel 



The fire-box containing the burning coke . 



The hollow metal casing surrounding it secured 



by bolts and nuts, and filled with water 

 The grate bars forming the bottom of the fire-box 

 The fire door through which coke is put in from \ 



time to time to feed the furnace . 

 The tubes traversing the boiler longitudinally \ 



through which the hot gases of combustion f 



and smoke pass from the fire-box to the 



smoke-box . . . . 

 The smoke-box at the base of the funnel, receiving 



the heated air from the tubes 

 The smoke-funnel over the smoke-box and blast- 



pipe . . 



The regulator, by which more or less steam 



allowed to pass along the steam-pipe, and by 



closing which the steam is altogether cut off f 



from the cylinder * 



The stage upon which the engine driver and stoker 



stand . 



