74 Two Cases of Congenital Night- Blindness. 



Annulus 315. Observer E. 



S.S.N. 



Corrected 

 annulus 

 reading. 



Absorption 

 factor. 



Product of 

 2 and 3. 



Or 



Reduction to 

 one candle 

 foot + 1 -155 

 (log.) 



Limit of 

 Tision. 



60 



66 



-0 -01170 



-0-772 



1 



•228 



2-383 



-0242 



58 



106 



-0 -01184 



-1-255 



2 



-745 



3-900 



-0079 



56 



143 



—0 -01197 



— 1 -712 



2 



-288 



3 -440 





54 



158 



—0 -01212 



— 1 -915 



2 



-085 



3 -240 



-00174. 



52 



153 



— -01229 



— 1 -979 



2 



-021 



3 -176 



-001 "^n 



50 



124 



-0 -01244 



- 1 -966 



2 



-033 



3-188 



-00154 



4S 



136 



-0-01259 



-1-926 



2 



•074 



3-229 



-00170 



46 



144 



-0-01273 



-1 -833 



2 



-167 



3-322 



-00210 



44 



136 



-0-01288 



-1-752 



2 



•248 



3-403 



-00253 



42 



126 



-0-01302 



-1-641 



2 



■359 



3-514 



-00374 



40 



115 



-0-01318 



-1-516 



2 



-484 



3-639 



-00436 



38 



105 



-0-01334 



-1 -401 



2 



-599 



3-754 



-00560 



36 



91 



-0-01354 



-1 -232 



2 



-768 



3-923 



-00838 



34 



78 



-0 -01374 



-1-072 



2 



-928 



2-083 



-0121 



32 



66 



-0 -01390 



-0-917 



1 



•088 



2-238 



-0173 



Annulus 315. Observer B. 



S.S.N. 



Corrected 

 annulus 

 reading. 



Obstruction 

 factor. 



Product of 

 2 and 3. 



Or 



Reduction 



of D to 

 one candle 

 foot + 1-155 

 (log.) 



Limit of 

 vision. 



60 



73 



-0 -01170 



- 1 -088 





-912 



2-097 



-00125 



58 



102 



-0-01184 



- 1 -208 



2 



•792 



3-947 



-00807 



56 



135 



-0-01197 



-1-156 



2 



•484 



3 639 



-00436 



54 



147 



-0^01212 



-1-782 



2 



•218 



3-373 



-00236 



52 



155 



-0^01229 



-1-905 



2 



-095 



3-250 



-00175 



50 



157 



-0 ^01244 



-1-953 



2 



•047 



3-202 



-00159 



48 



157 



-0-01259 



-1 -972 



2 



•028 



3-183 



-00152 



46 



152 



-0 ^01273 



-1-935 



2 



•065 



3-220 



-00166 



44 



144 



- 0^01288 



-1-855 



2 



•145 



3-300 



-00200 



42 



136 



-0 -01302 



-1 -771 



2 



•229 



3-384 



-00242 



40 



128 



-0-01318 



-1-687 



2 



•313 



3-468 



-00294 



38 



120 



-0-01334 



-1-601 



2 



•394 



3-549 



-00354 



36 



112 



-0-01354 



-1 -516 



2 



•484 



3-639 



-00436 



34 



103 



-6-01374 



-1 -415 



2 



-585 



3 -740 



-00550 



32 



93 



-0-01390 



-1-293 



2 



-707 



3 -862 



-00727 



B, 61 -3 ; Li, 59 -8 ; C, 58 •I ; D, 50 6 ; E, 39 ^8 ; h, 37 '7 ; F, 30 -05 ; Blue Li, 22 -8 ; G, 11 -2. 

 Tbe above give the positions of Fraunhofer lines on tbe (arc) spectrum scale. 



