GENERAL SCIENCE 



Indirect Lighting. Whenever a light is equipped with an opaque 

 or partially opaque bowl reflector, and the rays of light are directed 

 upward to be reflected back by a white ceiling, the room is lighted 



Ground glass globe. Opal Glass Globe. 



FIG. 252. Within each globe is a lamp of the same candle-power. Note the 

 superior diffusion of the light by the opal globe. 



by indirect light. This form of light is often considered the best, 

 since it lights the entire room and relieves the eyes from all strain. 



Semi-indirect Lighting. Translucent bowl reflectors which allow 

 some of the rays of light to pass through, but reflect the majority 



FIG. 253. Direct FIG. 254. Semi- FIG. 255. Indi- FIG. 256. Semi- 

 light, direct light. rect light. indirect light. 



of the rays of light upward to be reflected back by the white ceiling, 

 are often used to produce semi-indirect lighting. 



Light Transmitted through Various Colors. The amount of light 

 transmitted through colored glass is quite important if shades are 

 used in the home. Less light is transmitted through red than 

 through green. Red lights have always been the danger signal on 



