XXIV 



PROCEEDINGS. 



TESTS OF THE AIR IN THE CHEMICAL LABORATORY, PROVINCIAL NORMAL 

 SCHOOL, TRURO, NOVA SCOTIA. 



Date. 



Mar. 



7 

 H 

 15 



21 



22 

 24 



17 



22 



8 



15 



22 



8 



9 



i5 



17 



9 



16 



21 



23 



7 



10 

 26 



27 



Time. 



A. M. 

 9.00 

 g.oo 

 9.00 

 9.00 

 9.00 

 9.00 

 9-45 

 9-45 



IO.OO 

 IO.OO 

 10.00 



10.40 

 10.40 

 10.40 

 10.40 

 12 m. 

 12 m. 

 12 m. 

 12 m. 



P. M. 

 5.OO 

 5.00 

 5.00 

 5-00 



Condition of the Laboratory. 



Empty 6.42 



4.28 

 3-2i 

 4.28 

 16.05 

 6.42 



34 students 40 m. high wind . , 9-63 



32 windows open 16.05 



i h 20.33 



" windows open 9.63 



" windows and doors open 16.05 



i h., 40 m., windows and doors open. . . . 23.54 



21.40 



windows open . 10.70 



i h 16.05 



" windows open 20. 33 



17.12 



i h., 15 m., Blow-pipe lamps in use 48-15 



windows open 17.12 



Empty 16.05 



20.33 

 42.80 

 Laboratory used for blow-pipe work in mineralogy for 



i h., 45 m., by 20 students ' 65.00 



C O 2 

 (parts in 

 10,000.) 



The observations made in the Laboratory were chosen for presentation 

 because they present, 



1. A mean between the worst and best rooms in the building. 



2. A greater variety of conditions than any other room. 



3. A large air space per pupil 9 cu.m., or 318 cubic feet. 



4. Less interference from other rooms, and from interruption during- 

 the test. 



The month of March was chosen because at that time the laboratory 

 work consists of lectures and blow-pipe analysis, where few chemical 

 re-agents aie used and those mostly in the " dry " state. With one 

 exception, March 21, no blow-pipe work was done till after 3 o'clock in 

 the afternoon. Moreover, March presents many warm days when it is 

 possible to have windows open, while in the winter the insufficiency of 

 our heating apparatus is such as to make this impossible. It has been. 



