(30) 



.2' =±0.15, corresponding Avitli a group-variation of about 31°. 

 The group-amplitude is only slightly affected by this \'ariation as: 



sin l{(t 



—r — = 28.58 

 sin a 



instead of 30. 



When R, the total number of periods, increases, the secondary 

 maxima will become smaller and smaller, and at" the same time 

 maxima and minima will approach nearer to the principal maximum. 



T ABLE III. 

 Results of the arranpeinent according to dilTcrcnt jicriuils hy tlic shirting-process. 



Table III exhibits the outcome of this shifting of the groups and 

 fig. 2 shews both the theoretical and actual curves. 



For the sake of couiparison the (htta of Table III have been 

 multiplied by '1 and the amplitude of the theoretical pei'iod has been 

 taken equal to 0.1. 



