PHOTOMETRIC SCALE. 137 



" The following short table of the photometric quantities of 

 1 7 stars of the 1 st magnitude (as obtained from the photome- 

 tric scale of magnitudes) may not be devoid of interest:" 



Sirius 4-165 



y Argus ...... 



Canopus 2-041 



aCentauri I'OOO 



Arcturus 0-718 



Rigel 0-661 



Capella 0-510 



aLyrae 0-510 



Procyon 0-510 



a Orionis 0'489 



aEridani 0-444 



Aldebaran 0-444 



|8. Centauri 0*401 



aCrucis 0-391 



Antares 0*391 



a Aquilse 0'350 



Spica 0-312 



44 The following is the photometric quantity of stars strictly 



belonging to the 1, 2 6 magnitudes in which the 



quantity of the light of a, Centauri is regarded as the unit :" 



Magnitude on the vulgar scale. Quantity of Light. 



1-00 0-500 



2-00 0-172 



3-00 0-086 



4-00 0-051 



5-00 0-034 



6-00 0-024 



