5° 



DAYLIGHT GLASS 



[Ch. II 



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

 daylight qualities. As each artificial light has its own special curve 



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

 Wave Length in Microns W 



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

 the Lamplight Filtered through Daylight Glass (172 CD). 



(From the Sibley Journal and the Anatomical Record). 



of intensity for the different 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, 



