22 



OSMOTIC PRESSURE OF AQUEOUS SOLUTIONS. 





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Fig. 10. — Third form of complete cell. 

 (A) Porous cell — upper half glazed; (B) brass piece; (C) manometer; (a) conical end of (5); 

 (6) vent for solution; (c) brass collar; (d) brass nut resting on ledge of (B); (e) and (e) brass 

 rings between which packing is placed; (/) brass collar screwing down upon (B) and com- 

 pressing the packing between the rings (e), (e) ; (g) brass ring. 



Fig. 11. — Fourth form of complete cell, 

 (a), (a) Brass or porcelain rings for compressing the packing and displacing it laterally; (6) brass 

 tube around which all metallic parts are assembled, upper end the same as in Fig. 10; 

 (c) brass piece employed in compressing packing and in adjusting initial pressure; (e) brass 

 collar; (/) brass ring; (g) brass nut, threaded internally, which is employed in adjusting 

 initial pressure by moving the tube (6). 



