BOOLEAN ALGEBRA AND CIRCUIT DESIGN 



285 



Table I 

 Sequence of Operation 



Total of 2^ = 32 combinations used. 



Note: is used to indicate that the relay listed at the head of the column is 

 operated, and 1 is used to indicate that the relay is released. 



ditions introduce pulses beyond 12, the circuit will without difficulty 

 recycle through combinations corresponding to pulses 11 and 12. 



Table I also indicates the leads which must be grounded in order to 

 provide the translations to the "two out of five" and "single lead" codes. 



The characteristics of this circuit may be summarized as follows: It 

 contains only five relays which is the absolute minimum necessary. It 



