148 



Prof. E, W. Wood on the Magnetic 



The wave-lengths and the corresponding rotations deter- 

 mined from the plates are given in the following tables : — 



Rotation 

 at Centre 450°. 



90° 5885-16 



180 5886-73 



270 5887-43 



360 5887-82 



450 5888-10 



540 5888-25 



630 5888-36 



810° 5891-97 



720 5892-14 



630 5892-29 



540 589259 



450 5893 39 



540 5894-20 



630 5894-44 



720 5894-59 



810 5894-72 



630° 5897-45 



540 5897-58 



450 5397-71 



360 5897-92 



270 5898-18 



180 5898-72 



90 5900-27 



.Rotation 

 at Centre 540°. 



90° 5884-69 



180 5886-40 



270 5887-09 



360 5887-54 



450 5887-80 



540 5888-03 



990° ... 



... 5892-05 



900 ... 



... 5892-14 



810 ... 



... 5892-29 



720 ... 



... 5892-46 



630 ... 



... 5892-70 



540 ... 



... 5893-39 



630 ... 



... 5894-07 



720 ... 



... 5894-31 



810 ... 



... 5894-44 



900 ... 



... 5894-57 



Eotation 

 at Centre 630°. 



90° ...... 5884-40- 



180 5886-17 



270 5886-92 



360 5887-35- 



450 5887-65- 



630 c 



5893-49 



Eotation 

 at Centre 270°. 



90° 5886-29 



180 5887-54 



270 588804 



360 5888-36 



450 5888-57 



630° 5891-80 



540 5891-95 



450 5892-20 



360 5892-51 



270 5893-45 



360 5894-36 



450 5894-64 



540 5894-83 



450° 5897'45 



360 5897-64 



270 5897-84 



180 5898-29 



90 5899-64 



Eotation 

 at Centre 360°. 



90° 5885-76 



180 5887-13 



270 5887-73 



360 5888-06 



450 5888-29 



540 5888-46 



810 5891-82 



720 5891-93 



630 5892-06 



540 5892-27 



450 5892-61 



360 5893-45 



450 ...... 5894-25 



540 5894-61 



630 5894-70 



720 5894-79 



630 5897-32 



540 5897-45 



450 5897-64 



360 5897-82 



270 5898-07 



180 5898-57 630° 5897-60 



90 5899-75 540 5897'75 



450 5897-94 



360 5898-22 



270 5898-50 



180 5899-23 



90 5900-74 



The values given above, which were determined by 

 Tieasnring the photographic plates, were compared with the 



270° 5898-65 



180 5^99-38 



90 ...... 5901-15 



Eotation 



at Centre 720°. 



90° 5884-10 



180 5885-83 



270 5886-59 



360 5887-13 



450 5887-44 



540 5887-70 



630 5887-89- 



1170° 5892-16 



1080 5892-29 



990 5892-44 



900 5892-61 



810 5892-89 



720 5893-47 



810 5894-06 



900 5894-32 



990 5894-41 



630° 5897-94 



540 5898-09 



450 5898-30 



360 5898-57 



270 5898-96 



180 5899-64 



90 5901-70 



