on the Magnetic Properties of Steel and Iron. 183 

 I denoting the distance between the poles of the magnets in 



It) all cases the specific magnetism, i. e., the magnetic moment 

 divided by the mass of the magnet, is given, "instead of the 

 magnetic moment, so as to allow a comparison of the results 

 obtained w front dimensions. 



The value of the horizontal intensity for one point in the 

 being known from a recent absolute determination 

 by Professor Kohlrausch, its value for the position of the mag- 

 netometer was obtained by relative determinations. 



As the results to be obtained did not possess sufficient quan- 

 titative importance to warrant an experimental determination of 

 the distance between the poles in the case of each magnet, 0'85 

 of the length of the magnets was used as approximation for the 

 quantity (I). 



The torsion-ratio of the fiber holding the mirror was deter- 

 mined as 0-00027 and not taken into consideration in the calcu- 

 lation of the results. 



i and 4 were hardened by stretching, one end being 

 II. Irox. Length = 100mm. Diameters 0-94mm. 



These wires were hardened by " pulling" them through the 

 number of holes designated in the second column, by the 

 method more fully described under "Hardening." (See 4, 



