180 



ROYAL SOCIETY OF CANADA 

 Manganin. 



This piece of maugauiu must have had more than the usual per- 

 eentiage of copper in its composition, for it was very soft, and had a 

 much lower specilic resistance than is usually given for this material 



t6 



2 



■C PER CEr>IT STRETCH 



Fig 4. 



J^'ig. 4 shows the relation of increase per cent resistance to increase 

 per cent stretch, for stretchings just beyond the elastic limit. 



