Cady — On the Energy of the Cathode Rays. 



11 



Pressure. 



V 



t-10 1 



V 



<?-10 5 



iV/Q 



0-033 







5-30 



3130 



106 



1-57 





+ 60 



7-20 



3090 



119 



1-91 



0-028 







2-10 



4320 



80-8 



1-12 





+ 60 



3-23 



4200 



113 



1-20 



0-029 







1-96 



5150 



75-5 



1-33 





+ 60 



4-91 



4960 



154 



1-58 



0-030 







1-90 



4230 



67-5 



1-19 





+ 60 



2-SO 



4130 



88-5 



1-31 



0-030 







054 



3910 



20-8 



1-02 





+ 60 



0-67 



3880 



25-3 



1-02 



0-031 







0-28 



4220 



11-9 



0-98 





+ 60 



0-56 



3900 



21-9 



1-01 



Bolometer 1 V. Seven strips, 11-5 Xl'3 mm . %o = 9-20 ohms. 



Values of the ratio were irregular, but the averages from 

 three groups of observations are here given : 



Pressure. i-10 7 Amp. iV/Q. 



0-070 9-43 0-81 



0-040 11-48 0-76 



0-023 0-18 0-72 



As with Bol. I, the ratio at high pressures seems dependent 

 upon the pressure alone. In the third group the cathode-cur- 

 rent was diminished by increasing the cadmium iodide resistance. 



These results are of only relative importance except as they 

 indicate that the absolute value of i V/Q is somewhat less than 1. 



A fifth bolometer was therefore made and mounted after 

 the Kurlbaum process upon a slate frame. After the silver 

 had been dissolved from the foil, the strips looked perfectly 

 clean and seemed free from strains. In order to keep the 

 cathode rays from the slate, a small brass diaphragm was placed 

 close over the bolometer, with a square opening of the same 

 size as the bolometer surface. 



Bolometer V. Seven strips, 7X0'73 mm . w = 8'72 ohms. 



The following observations were taken : 



D ressure. 



«-10 7 



V 



<?-10 5 



iV/Q. 



0-038 



6-10 



2270 



76-9 



1-80 



0-061 



5-00 



2690 



82-3 



1-58 



0-035 



4-80 



3480 



149 



1-12 



0-024 



2-26 



3770 



85-5 



1-00 



0-024 



2-09 



3560 



81-2 



0-92 



0-030 



1-69 



4460 



92-6 



0-81 



0-022 



1-36 



3730 



580 



0-87 



0-032 



1-09 



3740 



50-4 



0-81 



0-032 



1-06 



3750 



47 9 



0-83 



0-028 



0-50 



3900 



23-6 



0-83 



0-026 



0-255 



4740 



14-5 



0-83 



0-023 



0-040 



4800 



2-29 



0-84 



