LIGHTING OF INTERIORS. 



319 



In Fig. 3 are shown two curves as calculated and as determined 

 with the instrument. The average values were then got, and 

 plotted as function of the height of the lamps above the testing 

 plane. 



CANOLe-nerrocs 



pre. 3 



neroE -cANouss . 



/oo zoo 



O'btauce of lamp 



ABovsrssriNO PLAr^'£ 



o ICO 200 300 c£^T7i»rm?es 



DISTANCE OF L/i»P ABOVE rrsrir^G PLANS: 



Pig. 4 



F*G.5 



The results are plotted in Fig. 4. From the latter follows 

 Fig. 5, which clearly shows that the amount of reflected light 

 varies enormously with the position of the lamps. 



The tests were repeated, with the shades off the lamps. The 

 results are plotted in Fig. 6, from which follows Fig. 7. We see 



flfOCfW INCQEASE IN ILLUMINATION 



60^ 



Merce-CANot.es 



loo 200 300 C^NTinETPES 



asTANce or LAMP abovb resnua plans- 

 Fig. 6. 



fOO 200 300 C£Hri~1ETIl£.^ 



DISTAfVCS OTL^MP ABOve TSSTISO PLAHZ 



Fig. 7. 



