30 



S. BENT RUSSELL 



hibition as explained previously. Table II represents a diverg- 

 ing gang to illustrate the association of ideas as explained. 



Figure 5 shows how three movements, MO, MD and ML, 

 may be so co-ordinated that one key rod can, after the required 

 experience, cause three cylinders to move together where orig- 

 inally only one of the cylinders was started by the said rod. 



SL 



SR 



SS 



.XL 



JC3 



L 



MR 



1 -v ML 



Figure 6. Stream diagram for a duplex converging gang. 



Figure 6 and table III show a duplex converging gang. In 

 this arrangement the first key rod (or sensory terminal) SS is 

 known as the station key. MR and ML are opposite move- 

 ments. If SS and SL are habitually struck in succession except 

 when SS, SR and SL are struck in succession the device 

 will become "trained" so that when SS is struck the move- 



TABLE III (Fig. 6) 

 Duplex Converging Gang 



