5° 



DAYLIGHT GLASS 



[Ch. II 



and now colored glass is made which gives to artificial light true 

 daylight quahties. As each artificial Ught has its own special curve 



.41 .43 .45 47 .49 .51 .53 .55 .57 .59 .61 .63 .65 .67 .69 

 Wave Lengtti in Microns ^) 



Fig. 36. Curve of Energy Distribution in Mazda C Lamp, the Sun and 

 THE Lamplight Filtered through Daylight Glass (172 CD). 



(From the Sibley Journal and the Anatomical Record). 



of intensity for the diSerent parts of the spectrum, naturally a special 

 light filter must be worked out for each light source. Up to the 

 present, glass filters have been produced for the welsbach gas light. 



