60 



THE PRODUCTION AND USE OF LIGHT 



each window with two light shades, one for the upper and one 

 for the lower sash of the window. 



73. Obtaining Diffused Artificial Light. The first require- 

 ment in all modern lighting is that the light for the room shall 

 come from several sources, each of moderate intensity, rather 



FIG. 46. Plan of first floor of a modern residence showing system of electric 

 lighting; also other electric appliances. 



than from a single source of great intensity. Figures 46 and 

 47 are the floor plans of a modern residence, lighted by elec- 

 tricity. These plans indicate clearly the number and location 

 of the lights as placed by an expert lighting engineer. Notice 

 that in the living room there are nine ceiling lights, and four 

 wall lights thirteen in all. In the dining room there are four 



