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Abstract of Observations for Horizontal Intensity. 



From the preceding data we first deduce the moment of inertia, K, of the magnet and 

 its attachments, by the equation K ^ K, y._y, , where T, and T are the terms of 

 one vibration with and without tlie inertia ring, corrected for torsion, and reduced to 

 the temperature of experunents without the ring, and obtain the following values : — 



From the experiments of deflection we next deduce the values of ratio of m, the 



