NATURAL AND ARTIFICIAL LIGHTING 



61 



ceiling lights and one wall light, besides the central canopy 

 light. 



It is readily seen tliat, if the light for a room is thus obtained 

 from many sources, much the same effect is produced as 

 by strictly diffused light. The rays from the several different 



FIG. 47. 



-Second floor plan of a modern residence showing system of electric 

 lighting; also other electric appliances. 



sources are not parallel to each other; moreover, shadows are 

 practically eliminated. The expense of operating the many 

 small lamps to furnish a certain amount of illumination is not 

 materially different from that of operating a small number of 

 large lamps giving the same amount of illumination. 



The second requirement of modern lighting is that the light 

 shall be diffused. Lamps for use in residences, in schoolrooms, 



