534 



Mr. Gr. U. Yule on the Passage of Electric 



aluminium needle of the usual shape suspended by a quartz 

 fibre. One quadrant is connected to each wire. The needle 

 not being charged, throws are always in the same direction, 

 and are directly proportional to the time-integral of the 

 energy, or to the intensity of the radiation. First throws, 

 not steady deflexions, are read. 



Various glass jars w T ere used for holding the electrolyte. 

 The wires were run vertically through holes in the bottom of 

 the jar, strained straight, and cemented in. 



Experiments. 



Electrometer-readings were taken in pairs alternately with 

 the dish empty and with, say, 1 centim. of liquid in it, then 

 alternately with the dish empty and with 2 centim. of 

 liquid, and so on, a good many readings being taken at each 

 point to get a good average and eliminate spark- variations. 

 By this means one gets a curve showing the variation in the 

 transmitted intensity as the thickness of the layer is increased, 

 the intensity transmitted when the thickness is zero being 

 always taken as unity. 



Fig. 2. 







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Centimetres 



Transmission-curve for a thin layer CuS0 4 solution. 



