120 



Dr. J. Hobinson on the Photoelectric 



both plotted as ordinates against the thickness of the film. 

 The two curves pass through the ratio unity together. The 

 larger dissymmetry for currents than for velocities is well 

 marked. 



In order to determine more accurately whether the curves 

 actually do pass through the value unity together, the results 

 for a number of series of experiments are given together in 

 Table II. The films are numbered in the order in which they 



Table II. 



Number of Film. 



Tjl 



-y currents. 



-y velocities 

 (in volts). 



11th 



1-311 

 1-281 

 1-281 

 1-259 

 1-230 

 1-200 

 1-185 

 1-154 

 1-116 

 1-063 

 0-870 

 0'787 

 0-570 

 0-540 

 0-206 



1071 

 1-062 

 1042 

 1049 

 1035 

 1-020 

 1-030 

 1-022 

 1014 

 1-033 

 0-980 

 0-977 

 0-915 

 0-903 

 0-784 



i 



16th 



12th 



9th 



7th 



10th 



1st 



13th 



8th 



14th 



3rd 



15th 



2nd 



4th 



5th 





Fiji-, 



UJJI-'Q.O 



0-8 



7 

























T<> 



rf 



















1 



















; X- 



■i^J^"' 



/ 



<• 













*Lf^ 























7^ 



















. . 



! 



























0-2 



0-4- 



0-6 0-8 



— - Cu/fffCNTS 



1-0 



E 



were made. In fig. 3 the ratios currents are plotted as 



. E 



abscissae and the corresponding ratios T velocities as 



