for determining Voting's Modulus for Thin Wires. 263 



A second similar wire. /= 26*40 cms., mean diameter 



73 



•03550 cm. .'. area a of cross-section ='000990, and — 



a 



= l-82x 10 10 . 



Initial 

 stretching 



force 

 in dynes. 



M. 



gr. 



y 



mean. 

 cms. 



M 



yx y 



Vx--y-- 



M, M 



Vx _ i 



6. 



dynes/sq. cm. 



1870 X</ 



250 

 35 



•1614 

 •2208 



15490 -0260 

 158-51 -0487 













45 



•2767 



16263 -0705 



7-73 



•0505 



153 



278 XlO 12 





55 



•3284 



167-47 1078 



8-96 



•0591 



152 



2-77 



Mean e = 2"78xlO l 



Nickel wire^ No. 30 S.W.G. Z = 26'50 cms., mean diameter 

 = *03184 cm. .'. area a of: cross-section = '000796 sq. 



cm, and 9 — = 2*29 X 10 10 . 

 a 



Initial 

 stretching 



force 

 in dynes. 



M. 



gr. 



y *• 



mean. y 

 cms. 



y 1 - 



M x M 



yx y 



yx'-y 1 - 



M x M 



y^ v 



6. 



dynes/sq. cm. 



330 Xy 



15 

 25 

 35 



•3909 38-37 

 •5159 48-46 

 •6071 5765 



•1528 

 •2662 

 •3686 



10-09 



919 



19-28 



•1134 

 1024 



•2158 



88-9 

 89-8 

 89-3 



2-04x10^ 



206 



205 



450 xy 



15 

 25 



35 



•3566 42-06 



•4856 51-48 

 •5787 60-48 



•1272 

 •2358 

 •3349 



942 



900 



18-42 



•1086 

 •0991 

 •2077 



86-8 

 90-8 

 88-6 



1-99 X 10" 



2-08 

 2-03 



530 xy 



1 



15 



25 

 35 



•3033 49-46 

 •4328 5776 

 •5-!'.>4 66-11 



0920 

 1873 

 •2803 



8-30 

 8-35 



16 65 



•0953 

 •0930 



•1883 



87-1 

 89*8 

 88-4 



1-99 xlO 12 



2-06 

 2-02 



Mean e = 2-04xl0 12 . 



Aluminium ^ire< Nos. 25 and 30 S.W.G. were tried, but 

 neither gave consistent re-ult<, owing to permanent set being- 

 produced by the small loads used. 



