MEASURING ELECTRICAL CONDUCTIVITY 31 



For details regarding apparatus the reader is re- 

 ferred to the papers of Hibbard and Chapman (1915), 

 Washburn", Taylor and Acree", Rivers-Moore (1919), 

 Schlesinger and Reed (1919), Newberry (1919), Hall 

 (1919), and Stiles and Jorgensen (1914). 



F^^" Jj Electrode carrier, A, consisting of a glass tube provided with a series of side tubes 

 to hold an electrode tube, D, and a thermometer, £, also an inlet tube and an outlet tube. 

 To the right two glass cells, £, C, each with an inlet tube and an outlet tube, with disks of 



tissue, F and G, 



We may now turn to another form of apparatus 

 which may for convenience be called Type B. Fig. 7 

 shows one end of the apparatus, which consists of an 

 electrode holder. A, and a series of glass cells, B, C, 

 etc. The electrode holder consists of a glass tube pro- 

 vided with side arms for the admission of the electrode 

 tube, D, (which is similar to the tube used in Type A) 

 as well as of a thermometer, E. In addition there is an 



"See Washburn, B. W. and Bell, J. E. (1913), Wftshburn, B. W. (1916), 

 Washburn, K W. and Parker, K. (1917). 



" See Taylor, W. A. and Acree, S. F. ( 1916 ) , and previous papers In the 

 some journal. 



