226 Mr Orange, On certain phenomena of the katliode region. 



The former view seems better as yet, because 



(1) the luminous beams do not seem to be under the influence 

 of the electrostatic field, and 



(2) Kunz* states that "Prof J. J. Thomson, who applied a 

 very strong (magnetic) field to these rays, could find so far no 

 deflexion at all." (The rays referred to were obtained with an 

 equilateral triangular double kathode.) 



It was next proposed to devise apparatus in which the two 

 kathode plates were not connected by pins, but carried on separate 

 leads, and since we did not know definitely by what amount the 

 plates should be separated, to secure the best results, it was 

 decided that this should be susceptible of adjustment while the 

 discharge was running. 



Experiment II. 



The apparatus is represented in Fig. 6. One anode A and one 

 kathode B are supported from above while the other kathode G 

 and the anode D, which are mechanically connected by ebonite, E, 

 can be moved up and down by means of a barometer column with 

 moveable reservoir. (The float H, which is used in this process, 

 makes contact between the kathode lead and the mercury of the 

 column. The anode lead is attached to the fine spiral of wire G, 

 so that it is readily moveable.) 



The kathode plates were similar to those used in the first ex- 

 periment but were bevelled as shown in the figure, with the object 

 of simplifying the section of the kathodes and hence of the elec- 

 trostatic field. The two plates, or rather their connections, were 

 joined externally by a wire. The two anodes were used in de- 

 termining whether the kathode region were quite independent of 

 the situation of the anode. On observing that this was so, the 

 lower anode was disconnected and the upper one alone was em- 

 ployed throughout. 



Although it was possible to obtain views of the kathode region 

 similar to those of the first experiment, photography in this 

 direction, i.e. vertically downwards, was out of the question owing 

 to the inconvenience of the arrangements. It could be seen, how- 

 ever, that the canal rays formed beams very similar to those 

 obtained with the original double kathode. 



The canal rays are most conspicuous when the separation of 

 the plates is about 3 mm., but they are observed quite easily with 

 separations of from 1 to 15 mm. With the larger degrees of 

 separation the beams are more convergent than those described in 

 Expt. I. 



* J. Kunz, loc. cit. p. 177. 



