and Laboratory Methods. 



2421 



Windows on each floor, nine, opposite : 



Basement, height, 14i^ feet ; width, (5}^ feet ; rectangular. 



Main floor, height, 1'2}4 feet ; width, Qy^ feet ; rectangular. 



Gallery floor, height, 8 feet ; width, 6j4 feet; rectangular. 



Fourth floor, height, 14 feet at center; width, Qy^ feet; pointed arch. 



Fig. 84. — Cornice and Floor Windows. 



This original section of the New York museum was placed north and south, 

 with double illumination. Such illumination as this produced was unexcelled. 

 There was some slight loss of wall space, but with pier cases, reaching out into 

 the hall, this was compensated, and in the instance of flat table cases the loss of 

 wall space is unimportant. 



Fig. 35. — Successful Window Construction, New York Museum. 



The third stage of lighting halls, when the lighting is from both sides, with no 

 reservation of wall space, affords the most simple problem of all. In such halls 

 the objects are exhibited in the center in table cases or in large upright cases, 

 and the light can be produced most easily. 



