MEASURING ELECTRICAL CONDUCTIVITY 31 



For details regarding apparatus the reader is re- 

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

 Washburn 14 , Taylor and Acree 15 , Rivers-Moore (1919), 

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

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



if' II 



'.I 



G C 



FIQ. 7. Electrode carrier, A, consisting of a glass tube provided with a series of side tubes 

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

 To the right two glass cells, B, 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, Z>, (which is similar to the tube used in Type A) 

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



M See Washburn, E. W. and Bell, J. E. (1913), Washburn, E. W. (1916), 

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



" See Taylor, W. A. and Acree, S. P. (1916), and previoua papers in the 

 same journal. 



