INDUCTANCE AND CAPACITY 



435 



is connected, is out of balance, the galvanometer coil will be 

 set in vibration and this image will become extended into a band 

 of light. 



a 4 



fl 2 



i 



-Mil 



Microvolts' 



100.0 100.1 100.2 100.3 100.4 100.5 100.6 100.7 100.8.100.9 101.0 101 JL 101.2 101.3 

 Frequency-Cycles per Second 



[G. 255 A. Showing effect of tuning, on current and voltage sensitivities 

 of a vibration galvanometer. 



Total Flux 



FIG. 255#. Showing effect on the voltage sensitivity of a vibration gal- 

 vanometer when the flux cut by the coil is varied. 



The instrument shown in Fig. 255 is a D'Arsonval galva- 

 nometer so designed that the coil may be given a high rate of 

 vibration. The small sketch at the side shows how the rate may 

 be varied, that is, how the instrument may be tuned to the 

 frequency of the circuit. A flat strip suspension is used, the 



