[438 ] 
chain a proper direction in order to move the ba- 
lance. 
MN is the fleam-cock ; the end N being fuppofed 
to be detached from a pipe, that gives it com- 
munication with the boiler. 
0 is the injedtion-cock, whofe key is turned by the 
arm 0 m. 
P is the injedlion-pipe, communicating between 
the forcing-pipe above the valve, and the top of 
the receiver. ' 
R S is the arm, by which the key of the fleam-cock 
is worked. 
IK two rollers annexed to the balance, which, by 
fbriking upon the arm RS ) open and fhut the 
fleam- cock, as the balance is moved backward and 
forward. 
R n o is the fleam-cock’s key-tail, which is furnifhed 
with two fmall rollers, //, o t which open and fhut 
the injedlion-cock, by adting upon the arm O m in 
fuch a manner, that, when the fleam- cock is 
opened, the injedlion is fhut, and •vice verfa. 
T is a bell of advice, which, moving along with the 
balance, continues to ring as long as the engine is 
at work. 
V is a cock, which ferves to difcharge the air from 
the receiver, and is open’d by hand, when neceffary. 
IV is a weight fufficient to raife the balance to a per- 
pendicular poflure, when it is inclined to the right, 
and alfo to overcome the fridlion of the float, axis, 
pulli es, chain, &c. 
To put the engine in motion, prefs down the arm 
AB , which will bring the balance over to the right 
fide, and in its motion will open the fleam-cock, and 
fhut 
