TABLE OF RESULTS. 551 



Mean Current of a Series of Induced Discharges. 



Da,e and Observe, y . 



Cm. 



1884. Roiti 105-89 



1885. Himstedt 105-98 



Damping of Magnets. 



1882. Dorn 105-46 



1884. Wild 106-03 



1884. H. F. Weber 105-26 



1884. Bailie 105-67 



Mean Action of the Current Induced in a Rotating Frame. 

 1865. Committee of the British Association ... 104-83 



1881. Lord Rayleigh and Schuster I0 5'95 



1882. Lord Rayleigh ... ... ... ... 106*25 



1882. H. F. Weber 106-16 



Current of Continuous Induction. 



1873. Lorenz ... ... ... ... ... 107-10 



1883. Lord Rayleigh and Mrs. Sidgwick ... 106*22 



1884. Lorenz ... ... ... ... ... 106*19 



1884. Lenz 106*13 



1884. Rowland, Kimball, and Duncan 106*29 



1885. Lorenz I0 5'93 



1128. These results do not perfectly agree, and there is some- 

 thing arbitrary in the choice of a definite value ; nevertheless the 

 causes of error inherent in some of the methods are sufficient to 

 explain the most divergent results. 



The calorimetric method is excellent in principle, but the un- 

 certainty that may still exist as to the mechanical equivalent of 

 heat which enters into the calculation, leaves some doubt as to 

 the accuracy of the results. 



The damping of magnets, and successive induced discharges, 

 have given the smallest numbers we have dwelt sufficiently on 

 the difficulties which these two methods present. 



The necessity of making the axis of rotation perfectly vertical, 

 and especially the time of displacement of a frame of large dimen- 

 sions, are reasons for some doubts as to the results furnished by 

 Weber's first method. 



