758 Experiments ivith Vacuum Gold-leaf Electroscopes. 



A remained apart so long as the light from the Nernst lamp 

 fell upon them. If a spirit-flame was used instead of 

 the Nernst lamp no charge could be got on electroscope 

 B, although the gold leaves o£ electroscope A stood wide 

 apart. 



bo 



Other vacuum electroscopes, having metallic coatings 

 of fine brass wire gauze and aluminium foil on the inside of 

 the glass enclosure, were set up, and all the foregoing- 

 experiments were repeated. The results obtained correspond 



