62 



CALORIMETERS FOR STUDYING RESPIRATORY EXCHANGE, ETC. 



right-hand arm of the balance. The remainder of the weight is made up 

 with brass weights placed in the pan. 



In order to suspend this heavy absorber, a small elevator has been con- 

 structed, so that the vessel may be raised by a compressed-air piston. This 



Fio. 29. — Balance for weighing absorbers, showing general type of balance and 

 case surrounding it, with counterpoise and weights upon right-hand pan. A 

 sulphuric-acid absorber is suspended in position ready for weighing. Elevator 

 with compressed-air system is shown in lower part of case. 



piston is placed in an upright position at the right of the elevator and is 

 connected with the compressed-air service of the building. The pressure is 

 about 25 pounds per square inch and the diameter of the cylinder is 2.5 

 inches, thus giving ample service for raising and lowering the elevator and 



