324 SIE F. W. DYSON, PEOF. A. S. EDDINGTON AND MR. C. DAVIDSON ON A 



The normal equations are 



whence 



5S/+ 2-838* 

 2-838/+4-838K- 



S/c = 



+1 

 -105 



105, 

 33. 



The corresponding deflection at the limb is 



l"-75 0"-31 = l"-44. 



Plate W. 



Although the exposure was only 10 seconds the images have jumped in R.A., so 

 that the appearance is dumb-bell shaped. They are, however, symmetrical, so that fair 

 measures of x can be made ; the y measures on which the result chiefly depends are 

 unaffected. Star 10 is very diffused in R.A. 



(1) Comparison with Oxford Plate DI. 



Theoretical plate-constants 



a =+4-9, b, d=+6-5, e=+39-7. 



