186 



Mr. G. Pierce on Indices of 



These values are plotted in Curve I. (lig. 6), with the 

 readings of distance as abscissae and the corresponding relative 

 intensities as ordinates. 



Fisr. 6. 



180 



160 



140 



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8 9 10 11 12 13 14 15 16 17 18 



Reading of Distance in centimetres. 



Nodes and loops are found to be located at the following 

 points : — 



Nodes. Loops. 



9-8 8-5 



11*9 10'9 



14-0 12-8 



16*3 ]5-l 

 17-5 



"Which gives the following values for the distance between 

 successive nodes or successive loops, in centimetres: — 



2-1 

 2-1 

 2-3 

 2'4 

 1-9 

 2*3 

 2'4 



Mean 



2*21 The half wave-length. 



