36 



OSMOTIC PRESSURE OF AQUEOUS SOLUTIONS. 



on the contents, which is nearly equal to the osmotic pressure. Hence 

 the subsequent diminution in the volume of the gas is small. The only 

 disadvantage experienced in the later form of manometer is due to the 

 larger volumes of mercury which must be stored up in them. The 

 "thermometer effects," resulting from slight fluctuations in the temper- 

 ature of the baths, are therefore more pronounced in them than in the 

 other form of instrument. 



Fig. 20. — Manometer with glass cone for 

 cells with taper necks (see Fig. 12). 



(1) Reservoir with trap; (2) reservoir for 

 expansion of nitrogen under diminished 

 pressure; (3) vent for solutions. 



A 



V 



/AVA\ 



s 



w 



/ 



