M'Clelland — Comparison of Capacities in Electrical Work. 177 



electrometers when their use can be" avoided by means of galva- 

 nometers and other, sometimes complicated, apparatus. Some of 

 the lines of research in recent years have necessitated an extensive 

 use of quadrant electrometers, with the natural result that they 

 have been greatly improved ; and whatever reasons there may for- 

 merly have been for avoiding the use of electrometers, these reasons 

 have now entirely disappeared. 



