488 Mr Filon, On the variation with the wave-length 



Feb. 24 



Feb. 25 



y(»+l)_y(») 



in cms. 



X in tenth- 

 metres 



(Op)-* 



y(n+l) _ y(n) 

 in cms. 



X in tenth- 

 metres 



(dp)- 1 



•670 



6250 



1070 



•693 



6440 



- 1077 



•645 



6040 



1070 



•657 



6210 



1057 



•615 



5860 



1050 



•623 



6000 



1039 



•595 



5690 



1045 



•615 



5830 



1055 



•570 



5530 



1030 



•595 



5650 



1053 



•555 



5390 



1030 



•575 



5500 



1045 



•540 



5260 



1025 



•560 



5360 



1045 



•525 



5140 



1020 



•550 



5240 



1050 



•510 



5030 



1015 



•535 



5120 



1045 



•495 



4930 



1005 



•515 



5010 



1028 



•485 



4830 



1005 



•505 



4910 



1029 



•475 



4740 



1000 



•495 



4810 



1029 



•470 



4650 



1010 



•490 



4720 



1038 



•462 



4570 



1010 



•480 



4630 



1037 



•452 



4490 



1005 



•473 



4550 



1040 



•448 



4430 



1010 



•460 



4480 



1027 



■436 



4370 



1000 



•454 



4420 



1027 



•430 



4310 



1000 



•450 



4360 



1032 



•424 



4260 



995 



•442 



4300 



1028 



•414 



4200 



985 



•440 



4250 



1035 



•410 



4150 



990 



•426 



4190 



1017 



•406 



4100 



990 



•418 



4140 



1010 



•400 



4060 



985 









