450 ALTERNATING CURRENTS 



the reflected moonlight on the water, so an object on the road 

 is clearly silhouetted against this " specular reflection" from the 

 road. This is well illustrated by Figs. 404 and 405, where even 

 the very slight road ripples can be clearly seen. This reflection 

 is better obtained by using a few large units, spaced some dis- 

 tance apart, than by using a large number of small units placed 

 close together, as in attempting to obtain uniform illumination. 

 The use of automobiles has added to the problems of street 

 illumination. Owing to the high speed of this type of vehicle, im- 



Fio. 406. Illumination of Public Library, Lynn, Mass., with flood-lighting 



projectors. 



proper illumination may lead to many accidents. A very common 

 cause of such accidents is the improper location of the lighting 

 units at curves, etc. Care should be taken to so locate the 

 units as to eliminate the glare in the drivers' eyes and at the 

 same time to make clearly visible any object approaching in 

 the opposite direction. 



206. Flood Lighting. Many spectacular and pleasing effects 

 have resulted from flood lighting. This type of illumination 

 is obtained by projecting the light on the building or object to 

 be illuminated by means of properly located projectors. Flood 



PROPERTY OF ELECTRICAL LABORATORY,^ 



FACULTY OF APPLIED SCIENCE. 



