Photometry of Lights of Different Colours. 183 



Table I.— Data for Plates I., n., and m. (Pis. IV. & V.) 



The flicker luminosity curve for the 4^° field is reduced to 

 the value unity at *574 /j, at each illumination, and the other 

 data are given in terms of this. The data are corrected for 

 dispersion, but not for the energy distribution of the source. 



X. 



Field 8° 



6x5°-16 



Field 4°-58. 



Field l°-86. 



Flicker. 



Eq. of B. 



Flicker. 



Eq. of B. 



Flicker. 



Eq. of B. 



Illumination 270 Units. 



'657 /u 





105 









"... 



•565 



143 





142 



11-5 



13-3 



13-3 



•643 



269 



215 



270 



25-3 



25-0 



26-8 



•632 



42-9 



38-8 



42-3 



41-7 



42-0 



43-7 



•622 



58-8 



56-2 



58-4 



57-5 



55-3 



61-3 



•6125 



74-0 



71-6 



73-9 



74-7 



70-6 



77-9 



•593 



98-4 



98-8 



960 



97-8 



98-4 



971 



•574 



100-5 



103-1 



100-0 



98-6 



1000 



1000 



•555 



89-0 



96-8 



921 



926 



911 



93-3 



•545 



81-9 



88-8 



814 



81-7 



810 



81-7 



•535 



66-8 



74-3 



660 



67-2 



66-5 



693 



•526 



50-9 



590 



510 



510 



49-3 



49-8 



•517 



343 



361 



33-0 



327 



320 



324 







Illumination 68 Units. 







"655 fi 





... 



140 



17-4 



15-2 





•654 



15-6 



18-8 









19*3 



•642 



304 



307 



29-0 



311 



30-4 



34-4 



•632 



44-6 



460 



441 



49-9 



455 



50-5 



•622 



596 



60-3 



591 



654 



59-6 



653 



•612 



74-7 



765 



735 



81-3 



734 



786 



•593 



98-3 



952 



95-0 



100-5 



939 



996 



•574 



990 



96-8 



1000 



102-2 



1016 



1005 



•555 



87-8 



932 



89-8 



96-3 



883 



91-2 



•545 



77-0 



81-9 



80-8 



87-5 



79-4 



81-7 



•535 



64-5 



70-6 



67 9 



74-7 



666 



69-2 



•526 



50-0 



57-4 



52-2 



57-5 



509 



52-7 



•517 



33-3 



377 



35-5 



37-4 



31-5 



320 



Illumination 8-9 Units. 



•6525 n 



21-6 



204 



202 



19-2 



23-0 



253 



•642 



376 



344 



354 



37-4 



379 



43-8 



•632 



511 



471 



51-9 



51-1 



53-4 



591 



•622 



71-1 



68-4 



65-8 



690 



68-6 



801 



•612 



830 



79-8 



79-7 



79-0 



82-4 



953 



•593 



101-6 



94-5 



1016 



101-5 



102-8 



1167 



•574 



949 



102-2 



1000 



102-3 



106-4 



1152 



•555 



84-2 



1039 



87-9 



108-8 



934 



101-1 



•545 



716 



97-4 



75-6 



98-0 



79-3 



91-2 



•535 



58-1 



90-3 



61-0 



88-2 



67-0 



789 



•526 



44-8 



75-6 



48-4 



705 



50-5 



59'9 



•517 



27-7 



54-3 



30-9 



501 



316 



401 



•508 





311 



20-9 



284 



193 



22-5 



1 



