GENERAL APPARATUS AND MANIPULATION 



187 



One way 

 stopcock 



Bulb CaO. 1 n-^l - 



Stdndard buffer 

 lOf 1 A' HCI/ 



Capillary glass 

 membrane 



Ag-AgCI 

 electrode 



To calomel 



cell via 



KCI flusti 



To calomel 



cell via 



KCI flusfi 



Diagonal bore 



for filling, 



diameter 1 mm 



Three way 

 stopcock 



Rubber 

 i.ubing 



/ 



iMose ol Luer syringe 



Fig. 72. Sealed-in capillary- 

 glass electrode assembly. 

 From Pickjord (1937) 



D 



O 



O O 



D 



O 

 o o 



B 



D D 



Fig. 73. Conductivity cell. The 

 upper section shows the faces of the 

 two blocks which make the cell (actual 

 size), the center section, the construc- 

 tion, and below is an enlarged dia- 

 gram of the recess which holds the 

 fluid. Fro7n Bayliss and Walker (1930) 



cup attached to the filling inlet. The electrode is calibrated with 

 standard buffer, washed, and then dried with alcohol and ether. 

 After the sample has been introduced the lower stopcock is rotated 

 clockwise, first to flush saturated potassium chloride through the 

 groove and right- angle bore (the position shown in Fig. 72) and 



