Lord Rayleigh on Pin-hole Photography. 



1J=S7T. 



95 



z. 



*/V3. 



3M 2 . 







1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



•000 



•577 

 ■ 1-154 

 1-732 

 2-310 

 2-887 

 3-464 

 4041 

 4-619 

 5-195 

 5-773 

 6-350 

 6-927 



•2702 Max. 



•2159 



•1631 



•2110 



•2449 



•1734 



•0916 



•0739 



•0651 



•0335 



•0156 



•0178 



•0122 



1-9969 

 3-8317 

 70156 

 7-0878 

 10-1735 

 110361 



1-153 

 2-212 

 4-050 

 4-092 

 5-871 

 6-374 



•1631 Min. 

 •2467 Max. 

 •0737 Min. 

 •0739 Max. 

 •0154 Min. 

 •0178 Max. 



y = 4:7T. 



z. 



z/2. 



4M 2 . 







•000 



•0000 Min. 



1 



•500 



•0056 



2 



1-000 



•0609 



3 



1-500 



•1594 



4 



2-000 



•1947 



5 



2-500 



•1515 



6 



3-000 



•1293 



7 



3-500 



•1399 



8 



4-000 



•1148 



9 



4-500 



•0658 



10 



5000 



•0484 



11 



5-500 



•0458 



12 



6000 



•0280 



3-8317 



1-9158 



•1961 Max. 



5-8978 



2-9489 



•1291 Min. 



7-0156 



3-5078 



•1399 Max. 



10-1735 



5-0867 



•0483 Min. 



10-3861 



5-1930 



•0483 Max. 



As it appeared desirable to trace the curve corresponding to 



a smaller value of y than any given bv 



12 



Lommel, I have calcu- 



