Conductance produced in Gases by Rontgen Rays &c. 419 



sisted of an aluminium cylinder, 16 centim. long, 3 centim. 

 in diameter. This cylinder was connected to the case of the 

 electrometer. The insulated metal inside it, which was a 

 flat strip of aluminium about 10 centim. long and 1J centim. 



wide, cut from the same sheet as the surrounding aluminium 

 tube, was supported at one end by a small piece of paraffin so 

 placed as to be out of reach of the action of the Rontgen 



