434 Prof. J. V. Jones. Determination of the [Nov. 20, 



November 20, 1890. 

 Sir G. GABRIEL STOKES, Bart., President, in the Chair. 



In pursuance of the Statutes, notice of the ensuing Anniversary 

 Meeting was given from the Chair. 



Sir James Cockle, Mr. A. A. Common, Professor G. Carey Foster, 

 the Rev. Professor Price, and Dr. Rae were by ballot elected Auditors 

 of the Treasurer's accounts on the part of the Society. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : 



I. " On the Determination of the Specific Resistance of Mercury 

 in Absolute Measure." By J. V. JONES, Principal and 

 Professor of Physics in the University College of South 

 Wales and Monmouthshire, Cardiff. Communicated by 

 Professor CLIFTON, F.R.S. Received August 8, 1890. 



(Abstract.) 



In the hope of paving the way for a more accurate determination 

 of the ohm, the author has for a considerable time been engaged in 

 submitting to the test of experiment certain modifications of the 

 method of Lorenz which occurred to him as likely to lead to increased 

 accuracy and certainty. The experiments have been made in the 

 laboratory of the University College, Cardiff, with apparatus for the 

 most part constructed in the College workshop. Five complete sets of 

 observations were taken in the spring of this year, with the following 

 results for the specific resistance of mercury at C. : 



(i.) 94,103 absolute C.G.S. units. 



(ii.) 94,074 



(iii.) 94,093 



(iv.) 94,045 



(v.) 94,021 



Mean. . 94,067 + 10 (probable error). 

 The result may be otherwise expressed by saying that the ohm is 



