ILLUMINATION AND riloTn.M l-:ri!Y H'.> 



Uniform lighting is considered good engineering in the great 

 white ways which have become popular in recent years. The 

 conditions here are, however, quite different from those of average 

 street lighting. The intensity of illumination is very high. 

 Such white ways are almost always situated in the down-town 

 business streets where the light from the lamps is supplemented 

 by illumination from shop windows, illuminated signs, and 

 display lighting. Objects and persons are recognizable by very 

 slight differences in color or in outline, because of the high in- 



Hi.~>. Nitfht illumination. Naliant H>a<! M:i>> , with < irnrral 

 luminous arc lamps equipped with prism:iti- te> 



len.-ity of illumination which exists. This is analogous to interior 

 illumination. 



Another feature of road illiiminat ion ha> only recently become 

 Dliied. Automobile^ giv oiled, tanvd roads a glazed >ur- 

 \Yhen illuminated at night, light i> reflected from the 

 roadway to the Ob from a mirror. It is the >ame pheno- 



menon as the moon shiniim on the water. 1 ;md 10.") 



sliow example^ of this j)lienoiiieiion. which i> called ".prcular 

 rellectiun. is in the case of a floating object cominu, into 



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