566 



REPORT — 1887. 



pivot determines the smallest current whicli can be accurately measured, 

 and the friction of the clockwork is barely perceptible. 



The following table shows the performance of one of these vanes. 

 The conductor used had a resistance of O'l ohm : the first line shows the 

 rate at which the current was flowing through the conductor ; the second 

 line gives the ratio of current to speed of rotation, a ratio which ought 

 to be constant : — - 



When using higher currents the ratio is equally constant. 



