80 
MESSES. G. r. C. SEAELE AND T. G. BEDFOED 
cycles of torsion in which the load varied within the limits i 300 grammes. The 
changes in the load were made by steps of 50 grammes. 
Before the cycle of loading and unloading, during which the magnetic observa¬ 
tions were made, the wire was subjected to several cycles of positive and negative 
torsion, the load having the limits di 300 grammes. In every case, before the 
observations for Bg and W were made for any particular value of the torsion, the 
magnetic force was put through about 20 cycles of reversal; in this way we avoided 
the major part of the indeterminateness due to the diminution of Bg and W which 
occurs initially with continued reversals of Hg. (§ 46.) 
The results of these experiments are given in the table below and are exhibited in 
fig. 11 
Fig. 11. 
