364 



Locke 



pressing both keys togetlier produces Signal 3 by the connections shown 

 in fig. 4, E. 



As is indicated in fig. 4, A, by dotted lines, the right-hand key 



BATTERY. 



CLOCK- 

 CONTACT 



rH-i 



rrn~o 



<) (^ 



d) 6 



«).- 



c) (^ 



) '^ 



S 



I 



•h 



(J) (> 



Ji? 



Fio. 4. — For description see text. 



thanks to its spare-contact, can also if required serve as short-circuit- 

 ing key to the stimulating electrodes in the secondary circuit of an 

 inductoriuni, in order to signal automatically the duration of a tetani- 



