CM*»RT aMOWlNG RtSIOUALS 



VCLC^ - OLUC 



Fig. 7a — The effect on the residual color of arc light \>y lilockiiig out narrow 

 l>an(ls at different positions in the spectrum. 



Fig. lit — Direct color photography of the >ptctrum of arc light and with the 

 Wrattcn A, B, C and D filters respectively interposed in the heam. 



