Sl*R<JKTf frttlsh 



Mean Intensity 



■ 



I 



V 



LIGHT SIGNALS 



FLASHINC SERIES 



Plate V 



Ad Fbuka lAatD Azu I I 



Mean Intensity 



Ulu.stKiluuj Sir -linrus Douglass's Paper 'On' Inif/roxemetUs in' Coast/ Signals'. 



£ 



