OF ARTS AND SCIENCES. 309 



Experiment 6a. — German-silver wire again. 



Original total length 1.70 metres. 



Length to be stretched 160 ,, 



Original total resistance 4.848 



Resistance of connecting wires 036 



Resistance of 1.70 metres 4.812 



Subtract ^(L. of this 283 



Resistance of 1.60 metres 4.529 



By examining the curve, it will be seen that it very nearly follows 

 the law, and that the conductivity of the metal is but little altered. 



Experiment 7. — This experiment was made with copper wire 



No. 18. 



Original total length 1.62 metres. 



Length to be stretched 1.67 „ 



