24 S. BENT RUSSELL 



Now, the further valve n moves to the left the greater will 

 be the effective opening for water from pressure port 5 to issue 

 port 13. Hence the effective opening at any stroke will be in 

 inverse proportion to the time interval since the previous stroke. 

 In other words the passage way will gradually close between 

 strokes. 



In the case of the lag valve 12, the further it moves to the 

 left the greater will be the effective opening for water from 

 pressure port 4 to issue port 14. As this valve always moves 

 to the left, it will be seen that the effective opening through 

 valve 12 is proportional to the maximum previous opening of 

 the ratchet valve. 



The combined effective area of valves 11 and 12 gives the 

 effective area of the transmitter, and it will be seen that this 

 area is susceptible to increase two ways, viz., temporary in- 

 crease by valve 11 and permanent increase by valve 12. A 

 rapid succession of strokes of the spur valve will cause a decided 

 increase of opening through the transmitter and hence a decided 

 increase in the discharge through the same when open. The 

 hydraulic pressure in pressure pipe 2 is assumed to remain 

 constant. 



It will be noted that when the spur valve is in its outward 

 position all ports are closed and there is no discharge through 

 the transmitter. When the spur valve is moved inward, how- 

 ever, it creates an opening the effective area of which depends 

 on the position at the time of the ratchet and lag valves. 



In other words, the transmitter is a valve whose maximum 

 opening is variable and is determined by the frequency of operat- 

 ing. Between operations the maximum opening is automat- 

 ically and gradually reduced. 



In figure 3 several transmitters, Sin, S3n, etc., are shown 

 connected so that their meter pipes 15 enter into a manifold 

 pipe 31. There are also several transmitters, S2n, S4n, etc., 

 similarly connected into a manifold pipe 30. In the figure the 

 transmitters are shown in a horizontal line for the sake of sim- 

 plicity. Of course, they will work just as well if arranged in 

 vertical columns with proper connections. Collecting pipes 30 

 and 31 discharge into opposite sides of exhaust passage 52 

 through meter cones 32 and 33. The discharge from 31 through 

 ^^ impinges on meter disc 35 tending to move it to the right 



