TRANSACTIONS 



OF THE 



^oba ,^i:otmn inatitute of Science. 



SESSION OF 1912-1913. 



On the Electrical Resistance of Acetic Acid in the 

 Solid and Liquid Phases. — By J. H. L. Johnstone, 

 B. Sc, Dalhousie University, Halifax, N. S.* 



Read, March 9, 1914. 



In a previous paper^ the writer published some results op:' 

 the electrical resistance of ice, showing how it varied with tHe 

 temperature. Its temperature-coefficient was found to be 

 unexpectedly large and a further investigation of this point 

 was thought desirable. 



As it had been difficult to obtain satisfactory regulation 

 of temperature below 0° C, it was decided to choose for thp 

 present investigation some substance with a melting-point so 

 high, that with the substance in the solid state, the temper- 

 ature could be regulated in a thermostat. Acetic acid appeared 

 to fulfil these conditions; and it can be easily obtained in a 

 comparatively pure state. 



The method of measurement used in the previous inves- 

 tigation was inconvenient. It was also felt to be unsatisfac- 

 tory as it was a direct current method and so introduced the 

 danger of polarization effects. It seemed desirable there- 

 fore to obtain some alternating current method. 



* Contributions from the Science Laboratories of Dalhousie University 1 Physics). 

 1 Trans. N. S. I. S. Vol., XIII, 2, pp. 126-144. 



Proc. & Trans. N. S. Inst. Sci., Vol. XIII. Tr.*.n3. 13. 



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