88 Prof. F. Clowes. Apparatus for ascertaining [Mar. 31, 



Fig. 1. 





A 



I! j| 

 t u 











The only inconvenience and delay experienced in making a series 

 of tests in this chamber, with varying mixtnres of gas and air, arose 

 from the difficulty in rapidly, and with certainty, replacing the 

 mixture in the chamber by fresh air. This was attempted at first by 

 blowing air from bellows through the opening in the floor of the 

 chamber. But the process was tedious and uncertain, because the 



Fig. 2. 



I 



