Photometry of Lights of Different Colours. 



861 



of the fovea. There is besides a considerable range in 

 position, although the maxima of all curves lie very nearly 

 together, namely at '55 (jl. 



Fi-. 3. 



Luminosity curves of all observers compared with the average curve. 



Phil. Mag. S. 6. Vol. 24. No. 144. Dec. 1912. 3 L 



