72 



OSMOTIC PRESSURE OF AQUEOUS SOLUTIONS. 



section of the inner compartment of one of the smaller baths. It is this 

 compartment which is maintained at any desired constant temperature, 

 and in which the cells are located during a measurement of pressure. 

 It is circular in form in the smaller baths, 300 millimeters in diameter 

 and 1 meter in height. Surrounding this is a large cylinder (B, B) 



r^ 



-et 



39 



s s, s 



ik^ 



Fig. 38. — Brass and copper bath for high- 

 temperature work. Vertical section. 



(A) Inner bath; (B) outer bath; (L),(L). 

 (L) , and (L) lamps ; (P) brass plate to 

 prevent water rising directly from 

 heated bottom of (B) to bottom of (A) ; 

 (Z) caps for lamp compartments. 



Fig. 39. — Brass and copper bath for high tem- 

 peratures, second vertical section. 



(^1) Inner bath; (C) pumping tubes; (E) space 

 into which water coming up (C), (C) is deliv- 

 ered; (S), (S), and (<S'i) gas stoves. 



which is twice as wide and much higher. In the space between the two 

 brass cylinders, the water is heated and made to circulate rapidly over 

 the exterior surface of the inner compartment (A). The circulating 

 system and the arrangements for heating the water by gas are shown in 

 Figure 39. C, C are the pumping tubes, 100 millimeters in diameter, 

 which unite at the top in the short but wider tube (D) . At the bottom, 

 they open directly over the gas stoves {S, S) . There is a third gas stove 



