368 GENERAL SCIENCE 



The light from the moon on a clear night is an example of a 

 " cold light." Such lights give rooms a bare, chill, and unfinished 

 appearance. 



Strong red light is harsh and trying. A yellow or orange tinge 

 in the light softens and brightens the interior. 



Globes, Shades and Reflectors. It is usually customary to 

 equip lamps with reflectors of some form of glass or other reflecting 

 medium to diffuse and direct the light in the most useful directions. 

 The following diagrams illustrate the distribution of light from a 



Bare Lamp Extensive Intensive Concentrating 



Distribution. Distribution. Distribution Distribution. 



FIG. 258. 



bare lamp, and also the distribution effected when the lamp is 

 equipped with different types of reflectors. Our homes should be 

 equipped not only with artistic reflectors but with such a type of 

 reflector that the maximum useful illumination will be obtained at 

 the smallest cost. 



Lamps, reflectors and shades should be kept clean, as dirt and 

 dust absorb light and thereby reduce the volume of illumination. 



Loss by Absorption, 

 Color of Glassware. Per Cent. 



Clear glass globes 5 to 12 



Light sand-blasted globes 10 to 20 



Alabaster globes 10 to 20 



Canary-colored globes 15 to 20 



Light blue alabaster globes 15 to 25 



Heavy blue alabaster globes 15 to 30 



Ribbed glass globes 15 to 30 



Opaline glass globes 15 to 40 



Ground glass globes 20 to 30 



