568 



REPORT OF NATIONAL MUSEUM, 1903. 



been installed with securely closed windows. It will, however, be 

 disctii'ded, since in modeling so much dust is stirred up inside that 

 it is thought that the dust from without could not be objectionable. 



I should not think it 

 proper, however, to 

 discard the system 

 merely for this reason. 

 The installation of 

 the ventilating appa- 

 ratus is shown in figs. 

 100-102. It cost $40,- 

 000, without taking 

 into account the ma- 

 sons' work on the boil- 

 ers and stacks, and was 

 set up by the Sturte- 

 vant Engineering Com- 

 pany (Limited) from 

 designs by Engineer 

 Thomas Young, of 

 Glasgow, based on the 

 plenum system. A de- 

 tailed description of 

 the diagrams shown in 

 the illustration may be 

 found in The Engineer 

 of September 20, 1901, 

 p. 312. The outer air 

 is drawn in at the top 

 of a large tower, 10 

 by 6i feet in cross sec- 

 tion, filtered, washed, 

 w a r m e d , and then 

 forced into the rooms 

 by means of electric 

 fans. These fans make 

 120 revolutions a min- 

 ute and convey 5,000,- 

 000 cubic feet of air 

 an hour into the build- 

 ing. The air that has 

 been used is drawn out through conduits near the floor, which lead 

 out above the roof. The entire arrjuigemeut has proved most satis- 

 factory up to the present time." 



« I inquired recently as to the efficiency of the heating and ventilati(»n after two 

 years' experience, and Mr. Cornish favored me with the following reply, dated 



