118 



Scientific Proceedings^ Royal Dublin Society. 



The upper of the two lower curves is the curve obtained by plotting the 

 area of the cyclic curves against the magnetic fields when a load of 10* 



Magnetic Field in C. S. G. Units. 

 Fig. 8. 



grammes per sq. cm. is on the wire ; and the last curve is that for a load of 

 2'43 X 10* grammes per sq. em. 



The two upper curves in fig. 8 are practically parallel for the two different 

 loads on the wire, and show that as the magnetic field round the wire is 

 increased from 4 to 10 c.g.s. units, the maximum twist is decreased about 23 per 

 cent, for the smaller load, and about 30 per cent, for the higher load, i.e., when 

 the load is increased 2'43 times the diminution of the maximum twist is 

 further magnified by about 7 per cent. 



As the magnetic field is further increased from 10 to 13-5 units, the 

 maximum twist decreases about 22 per cent, for the light load, and 28 per cent, 

 for the heavier load. 



This drop in the curves for a field of 13'5 units is what one would expect 

 from the curves given in Nagaoka's' report, where the maximum twist is 



Nagaoka, Report, loc. eit., p. 550. 



