230 NERVE. 



h e muscle break, including in this circuit 2 cells; the other 

 out leading pair wire to the time board terminals on the 

 right of the pendulum case. 



See that all connections are perfect. 



To the pendulum board, which is of wood, paper can be 

 pinned. The latter is smoked on a drum and when cool is 

 cut off and will then remain flat. Trim to the required size 

 and fasten in position with drawing pins. 



It next receives the time mark. The pendulum being held 

 to the right by the catch, a vertical line is marked upon it 

 at its left extremity by flicking the plum line (which hangs 

 from the centre of oscillation) against it as a guide for the 

 application of the writing points. 



The electric style is set to this line, and whilst it is 

 repeating its 96 vibrations a second the pendulum is released, 

 swings past, and the time subdivision is accomplished. Raise 

 the writing point off the surface. 



As the pendulum always starts from the same point it 

 practically always swings at the same rate, and the one time 

 mark is sufficient for all the records which may be inscribed 

 above each other upon the same paper as long as they all start 

 from the plumb line. They will also have the same relation- 

 ship to the time at which the knock-open key is actuated. 



The style is now connected to the muscle break key by 

 turning the rocker of commutator 9 (Fig. 44). 



Close the aluminium key by adjusting the screw counter- 

 poise; and see that the muscle is slightly stretched. 



Set the style close above the time record, close the knock- 

 open key, turn commutator 6 to the electrodes nearest the 

 muscle, open the S key and release the pendulum. 



Raise the point off the writing surface, return the pendulum 

 to the right-hand catch, close the knock-open key and take 



