1920.] Desiccants in Electrostatic Measurements. 9 
ing between the limits 0°010 and 0:015 volt per minute. 
Finally, after 220 hours, the acid was again stirred and the 
stirrer left underneath the surface. The leak of the quadrants 
regained the usual value and remained as satisfactory as 
Column II and in Diagram IV, can be reduced below one-fifth 
of the standard maximum permissible value, and can be kept 
practically constant for more than a week, without stirring or 
renewing the acid. 
ah re, Sela AANA IRENE el a ae a 
1 Improvements in measurements in Quadrant Electrometers, part 
TI, 1920. 
