TO face page 58. 



FIG. 21. Balance for Weighing Absorbers and Oxygen Cylinders. The absorbers are suspended on 

 a wire from left-hand arm of balance, and lead counterpoises are used on right side. Doors inclose 

 weighing chamber and prevent drafts. The lever on outside at the left actuates the elevator, which 

 raises or lowers the absorbers iu weighing chamber. 



