110 



Mr Whiddington, The Shadow Electroscope 



experiments on ionization, its position behind the leaf precluding 

 the possibility of disturbing convection currents. 



Cup for Condenser 



To Earth. 



To £ l/bLTS. 



The voltage range of the instrument is from 100 to 500 volts 

 and with a good leaf it is possible to estimate to 1 volt, an accuracy 

 sufficient for most purposes. 



