NATURAL AND ARTIFICIAL LIGHTING 63 



upper portion of the tungsten lamp without being diffused. 

 This direct light from the upper portion of the tungsten lamp 



FIQ. 51. Diffused light from tungsten lamp with frosted bowl and fluted 



glass reflector. 



is not permitted, however, to escape into the room. The 

 lamp is surrounded by a fluted glass reflector (Fig. 50). 

 This reflector reflects the larger por- 

 tion of the rays as diffused light, 

 mixing it with the diffused light 

 which passes through the frosted 

 bowl (Fig. 51 rays a, a, a, a, and 6, 

 b, b, b). A sufficient amount of 

 light to illuminate the ceiling of the 

 room passes through the fluted glass 

 reflector. This light is also diffused, 

 a', a', a', a', and b', &', &', V, Fig. 51. 

 74. Indirect Lighting. The best 

 artificial lighting is INDIRECT LIGHT- 

 ING. In the indirect system none Fl ' 52 -- Indirect U^t bowl, 

 of the rays from the light source is permitted to fall directly upon 



