THE CONTROL OF THE FACTORY 543 



The quantity determined on is represented by the weights placed in the 

 weight box, which furnish the power to actuate the scale. The supply of the 

 hquid into the scale is from the upper hopper tank, D, which is fed by the 

 feed, E, which forms its joint by descending on to the rubber seating, F. 

 This valve is raised through the plunger, G, by the power of the weight in 

 the box, C, and is controlled by means of the levers, K and L, which form a 

 dead centre. 



Fig. 347 



A full stream of liquid enters the weighing tank, B, until its weight in 

 the hopper begins to off-set the counterpoise, and in so doing releases the 

 plunger, G. The valve now partially closes and only a reduced flow enters 

 the hopper until the balance is reached. This final flow may be enlarged or 

 reduced, by means of the screw/. At the balance, the beam trips the arm, 

 W, and the valve completely closes. The lever, L, engages with the lever, N, 

 breaking the lock formed by the dead centre of levers A'' and M, and the 

 weight of the liquid opens the outlet valve and the contents of the tank are 



