Di fraction hy a Semi-infinite Screen. 57 



Fig. 2. 



'02 



'01 



'01 



'02 



'05 



'02 



'0+ 



'06 



'08 



' 













Q 





'05 



WO 







Table I. 



— \ = 4377 A.U. r=30-7o 



cm. 







Calculated 



Calculated 



Calculated 



Observed 







intensity at 



intensity at 



position of 



position of 







the maxima and tl 



le maxima and 



the maxima and 



the maxima and 







minima. 



minima. 



minima 



minima 







Case (1). 



Case (2). 



VI 



v*- 







1-374 



1-920 



1-225 



1-192 







'777 



•590 



1-871 



1-887 







1-199 



1-238 



2-345 



2-345 







•843 



•722 



2-739 



2-746 







Mol 



T300 



3-082 



3-077 







•872 



•7o7 



3-391 



3-409 







1-126 



1-243 



3-674 



3692 







•889 



•786 



3-937 



3960 







1-110 



1-219 



4183 



4155 







•900 



•820 



4-416 



4-422 







1099 



1-199 



4637 



4-615 







•909 



•820 



4-848 



4-850 







1-091 



1-153 



5050 



5-000 





