1878.] the Photometry of the Magneto-Eleetrk Light. 163 



Currents. Machine No. I. 

 Table V refers to Diagram IY. 



No. 



Revolutions. 



Tangents. 



Remarks. 



26 

 27. 

 28, 

 29, 

 30 

 31 

 32 

 33 

 34, 

 35, 

 36 

 37, 



300 

 350 

 460 

 540 

 240 

 308 

 370 

 425 

 460 

 500 

 580 

 600? 



1st set of 

 experiments. 



Experiments during 

 which the illumi- 

 nating power was 

 measured. Tables 

 II, III, and IV. 



Currents. Machine No. IT. 

 Table VI refers to Diagram V. 



No. 



Revolutions. 



Tangents. 



38 



398 



1-40 





490 



1-88 



40 



846 



3-08 



41 



264 



•10 



42 



280 



•12 



43 



288 



•17 



44 



384 



•38 



45 



438 



•48 



46 



458 



•53 



47 



484 



•56 



48 



534 



•67 



49 



692 



•92 



50 



842 



1-25 





862 



1 33 



52 



1,014 



1-45 



Remarks. 



Curve B, fig. V. 



1st set of 

 experiments. 



2nd set of 

 experiments. 

 Curve A, fig. VI. 



In Diagram II the stars show the vahie of the light [from the 

 method of extinction. 



