484 



REPOKT OF NATIONAL MUSEUM, 1903. 



again wanned, if necessary, by passing over hot pipes, and is forced 



into each room near the ceil- 

 ing and drawn off near the 

 floor. It can be independ- 

 ently shut off or turned on 

 for any of the rooms. At 

 first none of the windows 

 were arranged for opening, 

 the plate glass being set in 

 solid iron frames with cross- 

 bars. By this arrangement 

 only purified air could enter, 

 except such as streamed in 

 through the doors which 

 open onto the street. This 

 was very essential for keep- 

 ing the interior of the build- 

 ing and the books clean; but 

 the apparatus did not work 

 satisfactoril3^ The rooms 

 were often too hot, and con- 

 sequenth^, in 1899, at a con- 

 siderable cost, a row of win- 



Plaii of ventilat- 



FiG. 61. — Chicago Telephone Company, 

 ing plant. 



dows was changed so as to be 

 opened, and thus the entire 

 excellent!}^ devised system 

 was rendered useless. At the 

 time of the ver}^ high tem- 

 perature that prevailed in 

 Chicago at the beginning of 

 September, 1899, I found the 

 rooms intolerably warm, es- 

 pecially those with an east 

 and southeast exposure, in 

 spite of the open windows and 

 many electric fans placed 

 everywhere. It could not 

 have been w^armer with the 

 defective ventilating appara- 

 tus, some corridors and rooms 

 being like a bake oven. Much 

 dust came through the open 

 windows into the beautiful 



building, and the noise of the ^''^- 62.— Chicago Telephone Company. Plan of venti- 

 j_ , 1. , .. lating plaTit. 



street was distracting. 



As it w^as important for me to ascertain clearly the value of the 



