PROCEEDINGS OF TH?: CANADIAN INSTITUTE. 



91 



A Convenient Resistance for Electrolytic Analysis. By J. Watson 

 Bain, B.A. Sc. 



(Read roth Ffbrtinry, igoo. 



Chemists, who employ electrolytic methods, are often annoyed by difficulties 

 in obtaining a suitable current. Primary batteries are most unsatisfactory in 

 many ways, requiring constant attention, and being subject to considerable 

 variation in their current. Storage cells are very much more convenient, but 

 the necessity of charging is a drawback, and detracts somewhat from their 

 value. 



By means of a suitable resistance, the direct current of the ordinary incan- 

 descent circuit may be used with great comfort ; the variations which occur 



A 



ft 



B 







B 



B I 



A A ^^ 



are so slight as to be negligible, there are no cells to be kept in order, and 

 the current is always ready for use. A convenient resistance for thi.s purpose 

 has been employed in the chemical laboratory of the School of Practical 

 Science for more than a year, and a brief description of the apparatus, may be 

 of value to those, who have not had time to experiment tor them-selves. 



The arrangement is represented in the accomi)anyiug diagram in which 

 AAA represent three sixteen-candle power incandescent lamps, with their 

 sockets ; D is a single throw switch ; at C are two binding posts, to which 

 are connected the wires F leading to electrodes in the solution under analysis; 



