Molecular Conductivity of Amidosulphonic acid. 



by 

 Jöji Sakurai, F.C.S., Rigakuhakushi. 



Professor of Chemistry, College of Science, Imperial University. 



At the request of Dr. Divers F.R.S., I have determined the 

 molecular conductivity of amidosulphonic acid. The apparatus 

 which I used for the purpose, consisted of a Kohlrausch's universal 

 bridge, in which the measuring scale is so graduated that the index 

 at once gives the ratio of the lengths of its arms. The essential parts 

 of the whole arrangement are sketched out in the accompanying 



figure. The primary current from 

 two Darnell's elements, e, enters the 





a 



\L 



induction coil, i, the induced current 



divides at c (or cï), one part passing 



through the solution, s, and the other 



through the rheostat, r, both to return 



to the coil through d (or c). ab 



is the measuring 1 wire along which 



the index, d, is moved until the telephone, t, no longer speaks, at 



which point we have for the resistances of the various parts the 



following relation : — 



s : r : : bd : ad 



bd 

 or .9 = — rr. 



ad 



