LOCOMOTIVE ENGINE. 445 



which extend in the opposite direction to the lever p". The lever, p", is keyed upon 

 the cross shaft (/', and the other two, p'" p", upon another shaft q", both extending 

 to the side of the engine, and turning in carriages, like the weigh bars i" i'", and 

 having the vertical levers r" r" fixed upon their outer ends. The levers r" r" are 

 connected by the link / attached to both ; and one of them, r", extends above the 

 joint, and is attached to the end of the long bar t", extending to the back of the engine, 

 and connected to a similar lever, u", upon a short shaft, v", which is fixed on the 

 frame at the side of the fire-box. On the outer end of this shaft, v", and close to 

 the hand railing of the engine, is fixed the long handle w", which moves between 

 guide plates attached to the hand rail ; the outer guide having a notch in the middle 

 to hold the lever w" in a vertical position, and another at each extremity of the passage 

 between the guide plates. 



In Plates LXXXIX., XC., and figs. 1, 3, and 4, Plate XCI., the lever w" is shewn 

 pushed over into the forward notch, pulling the levers r" r" forward also, by the 

 bar t" and link a" ; causing the lever p" to be raised by the means of the cross shaft 

 q, and to pull up the ends of the eccentric rods e" e'", by the suspending rods o" o", 

 making the notches in them take hold of the pins in the bottom levers, /*" h", of the 

 weigh-bar. The two forward working eccentrics, E' E", are thus put into gear, 

 and made to work the slides of the two cylinders, and cause the engine to be pro- 

 pelled forwards. The other two lifting levers, p" p", are at the same time lowered 

 by the lever r" being pulled forward, letting down the rods f f" of the reversing 

 eccentrics by the suspending rods o" o", so that their forks clear entirely the pins 

 in the levers, n" n" ; leaving them free to move with the weigh-bar, and in exactly 

 opposite directions to the eccentric rodsf'f" below them. 



When the hand lever w" is placed in the centre notch of the guides, or in a 

 vertical position, as shown in fig. 2, (Plate XCI.,) the side levers r" r'" are brought 

 upright, and the lifting levers p" p" p" made horizontal ; so that the ends of the 

 middle eccentric rods are let down, and the notches in them escape from the pins in 

 the bottom levers of the weigh-bars : and the outside eccentric rods, ff, are only 

 raised into a similar position, and are still not in contact with the levers of the weigh- 

 bars. The slides will therefore cease to be worked, although the eccentric rods 

 continue moving, and the engine will not be propelled any more, as the steam con- 

 tinues pressing upon the same side of the pistons. 



But when the hand lever w" is pulled quite over into the back notch of the 

 guides, the positions of the eccentric rods are reversed ; the outside lifting levers, 

 p"p", being raised into the same position that the other lever, p, had before, and 

 drawing up the ends of the rods f" f" of the reversing eccentrics F' F", to catch 

 the pins in the levers n n" of the weigh-bar upon one of the inclined planes of 



