RATE OF NERVE CONDUCTION. 



229 



This key is included in the P circuit of the iriductorium 

 ('2 cells). The S circuit is wired to the inleading terminals 

 of the commutator (less cross wires). The opposite leading 

 out pairs of terminals are wired respectively to the upper 

 and lower terminals of the double electrodes of the muscle 

 break. These electrodes are 2'5 cm apart. 



FIG. 44. 1 Pendulum. 2, 2, Catches. X Smoked paper and points to style. 

 3 Plummet for comparing inscriptions, hooked aside when not in use, to the right 

 knock-open key in P circuit 4. S Circuit by 5 to Pohl 6, wired to double electrodes 

 in muscle break 7. In latter, muscle is attached to key in circuit 8 to Pohl 9, which 

 latter is wired to style X, and time board 10. 



'1. Recording circuit. Wire the electric style to the inlead- 

 ing terminals of a second commutator (less cross wires) and 

 one pair of the outleading ones to the aluminium key of 



