OF ARTS AND SCIENCES. 



311 



I 



Oriiiinal length \M metres. 



LiMifTth to bo stivtc'lied 1.52 „ 



Ke^istance of whole lengtli 2070 „ 



liesistaiice of leiijj;!!! not stretclieil 0008 ,, 



Resistance of wire to be stretched 2008 „ 



/ /-' R 



1.52 2.3104 .2008 



1.54 2.3716 .2008 

 1.56 2.434 .2020 



1.58 2.496 .2020 

 1.6 2.56 .2836 

 1.0^ 2.65 .2'J56 

 1.655 2.706 .298 

 1.67 2.789 .310 



1.69 2.856 .816 

 1.705 2.i}07 .3256 



/2 R 



^=.794 ^=.8 



Wive broke under 5.2 lbs. 



Experiment 9. — Copper loire, the finest yet. 



Original total length 1.56 



Length to be stretciied 1.52 



Original total resistance 780 



Resistance of connecting wires, &c 055 



/ /•^ n 



1.52 2.3104 .725 



1.5S5 .725 



1.55 2.4025 .725 

 1.565 2.444 .7298 



1.59 2.528 .7538 

 1.01 2.592 .7766 

 1.64 2.0896 .8018 

 1.67 2.789 .8318 



1.70 2.89 .8618 

 1.73 2.993 .8918 

 1.77 3.133 .9314 

 1.81 3.276 .971 

 1.855 3.441 1.000 



V- R 



r-= .671 7r= -7206 



If tbere were no change, i?j should have been 1.08 ohms. The wire 

 broke under pressure of 2.6 lbs. 



From the foregoing experiments, I conclude that the conductivity of 

 German-silver wire remains unaltered by stretching ; that the con- 



