452 



FERREE AND RAND— LIGHTING 



ments were made ; also the positions of the outlets : A, B, C, D, E, 

 F, G and H for the Hghting fixtures. In the drawing east eleva- 

 tion, one of the positions at which the tests were taken is repre- 



FiG. I. Plan of test room. 



sented, namely, the one with six reflectors in the field of view. 

 The walls and ceilings of this room are of rough plaster painted a 

 mat white. The floor is of medium dark tiling. 



I. Direct, Scmi-indirccf and Indirect Systems of Lighting. 



In our choice of the first set of conditions to be tested it was our 

 purpose to make a selection that would give a wnde variation in the 

 distribution factors. Three types of lighting were chosen. One 

 may be called an indirect system ; one a direct system ; and one a 

 semi-indirect system. The direct reflectors were not of the most 

 modern make, although they may be said to have given efifects very 

 similar to much of the lighting in actual use at the present time. 

 They were of porcelain ware i6 inches in diameter and only slightly 



