55 MEASUREMENT OF RESISTANCES IN ABSOLUTE VALUE. 



unit, the value of which in mercury should then be known. The 

 ratio of the mercurial unit to that of the British Association is 



According to Lord Rayleigh ... ... ... 0*95412 



Mascart, de Nerville, Benoit ... '95 3 74 



Mean ... ... ... 0*95393 



These two results differ by 0-0004. We shall take the mean 

 value to express in a column of mercury the experiments which 

 refer simply to the unit of the British Association. 



To the results of the experiments cited previously we shall add 

 a few numbers due to other observers : MM. Rowland and Kimball 

 by induced discharges, M. Himstedt* by the mean current of a series 

 of induced discharges^ M. Baillef by damping, M. LenzJ and MM. 

 Rowland, Kimball, and Duncan by the method of M. Lorenz. 



TABLE OF RESULTS. 



Calorimetric Method. 



Date and Observer. . Value of the Ohm 



in column of Mercury. 



Cm. 



1866. Joule 106-22 



1867. 106*10 



1877. H. F. Weber 105-88 



1885. Fletcher I0 5'95 



Discharge Induced in a Frame by a Rotation of 180. 



1874. F. Kohlrausch I0 5'9 I 



1884. Mascart, De Nerville, and Benoit ... 106-37 



1884. G. Wiedemann ... ... ... ... 106*19 



Discharge Induced by a Current. 



1878. Rowland 106*16 



1882. Glazebrook ... ... ... ... 106*29 



1883. Kimball 106*25 



1884. Mascart, De Nerville, and Benoit ... 106-30 



1884. H. F. Weber 105-37 



1884. Rowland and Kimball ... ... 106*31 



* HIMSTEDT. Berliner Berichte. Berlin, July, 1885. 



f BAILLE. Ann. Telegraph [3], Vol. XL, p. 261. 1884. 



% LENZ. Conf. Internat. des Unites Electr., Second Session, p. 30. 1884. 



