(27 ) 



Fig. 1. 



1 3 5 7 9 11 13 15 17 19 21 ;.'3 25 1 



As iiiigiil lia\c been expected tlie result of this calciilalioii slunvs 

 little oi' 110 (Jiltei-eiK'e from (hat of the arraiigenieiit itself. 



., = - rm ('= 2yr 7= 25.8():k 



As one day corresponds to ''""Vio-s» ^i xarialioii of .;■ degrees for 

 each group is eiiiii\'aleiil to: 



1.09 258 



. = 0.003'/. 



30 3G00 



6. \\\ application of the method discussed in ^ 2 to the dilfer- 

 eiices A„ and Li, of Table I \vc liiid: 



:i^ M\, — 145.05 :^^ J/^/ — 212.02 :i; m\,,i — — 12.44. 



From the well known forinula : 



tang 2 i|' 



2 M^ 



(10) 



for the situation of the principal axes of inertia, deduced from the 



