TO face page 32. 



FIG. 14. Vise for tightening Carbon-Dioxide Absorbers. Top of Absorber is held in a wooden vise 

 clamp by two handles ; Collar held in special clamp. 



FIG. 15. An Oxygen Cylinder with Valve, Rubber FIG. 16. Apparatus for Analysis of Oxygen and Air. 



Pressure Bag, and Purifying Attachments. On Two water-jacketed burrettes. Bj and B 2 , each with 



opening valve oxygen escapes through the metal water reservoirs, RI and R 2 , are connected by the 



tube through the purifying attachments. If the 3- way stopcock C. Pipette H is connected through 



pressure is excessive, excess of gas enters bag. a capillary (T) with the apparatus. 



