THE REGULATION OF TEMPERATURE. 



69 



Fig. 35. — Lower half of rectangular bath for measuring osmotic pressure — the "water compartment." 

 (1) and (2) Brass vapor-tight cover from which are suspended the copper cans which contain the cells; (3), 

 (7), and (8) one-half of the brass tubes belonging to the circulating system for hydrant water; (9) and 

 (10) copper tubes which open at both ends on the outside of the bath; (12) and (13) tubes through which 

 the water is drawn from bath and over the gas stoves; (14) large pipe through which water heated by the 

 gas stoves is again pumped into the bath. 



Fig. 3G. — Upper half of rectangular bath for measurement of osmotic pressure— "air" or 



"manometer compartment." 

 (1) and (2) Vapor-tight cover to "water compartment;" (3), (4), (5), and (6) screened lamps; (7) brass 

 pipes for circulation of hydrant water; (8) circulating system for hot water; (9) electric fan; (10) 

 thermostat. 



