RICHARDS AND MATHEWS. — HEAT OF EVAPORATION. 



)25 



source, as the temperature recorded by the thermometer was exactly 

 the same in all three cases. As long as the wire is covered with 



Figure 5. The Calorimeter. 



The vaporizer (V) is set within a large hole (XX) in the cover. At B is 

 attached the condenser A immersed in water contained in the calorimeter. 

 Between the jacketing vessels E and F is dilute alkali, into which sul- 

 phuric acid is dropped in order that the temperature of the surroundings should 

 keep pace with that of the calorimeter proper. C is a stirrer within the calo- 

 rimeter, H one in the outside vessel. 



liquid, it matters not whether the resistance wire is coiled loosely or 

 closely around the tube through which the vapor is passing. Hence 



