1890.] upon Magnetic Changes of Length in Wires. 473 



Table I.— Iron. 



Magnetic 



Elongations in ten-millionths of length with loads per sq. cm. of 



field 















in C.G-.S. 















units. 



351 kilos. 



585 kilos. 



819 kilos. 



1170 kilos. 



1500 kilos. 



lyoO kilos. 



7 



2 



2 



















9 







1-8 















1 1 



b 5 



o 

 o 









u 



16 



14 



12 



85 



2 



- 1 



- 2 



22 



20 



18 



11 -5 



25 



- 2 



- 2 5 



35 



27 



23 



14-5 



35 



- 3 



- 4-5 



50 



26-5 



23 



13 



2 







88 



25 



19 



9 







- 9 



-13 



138 



17 



10 



2 



- 7 



-17 



-24 



188 



10-5 



3-5 



- 3 



-13-5 



-23 



-32 



281 







- 9 



-18 



-24-5 



-37 



-48 



375 



-9-5 



-21 



-28 



-39 



-52 



-62 



Table II.— Nickel. 



Magnetic 



Contractions in ten-millionths of length with loads per sq. cm. of 



field 















in C.G.S. 















units. 



420 kilos. 



700 kilos. 



980 kilos. 



1400 kilos. 



1890 kilos. 



2310 kilos. 



13 



2 



2 



2 















16 



4 



3 



2 















19 



12 



5 



4 















28 



30 



9 



8 



1 



2 







34 



43 



22 



15 



2 



3 



2 



50 



69 



40 



27 



4 



5 



2 



69 









15 



8 





72 



102 



*65 



*53 









84 













7 



88 



123 



*96 



*73 



*26 



"l2 





103 



142 



123 



98 



43 



21 



13 



125 



162 



156 



122 



56 



30 



17 



159 



190 



193 



165 



88 



52 



32 



184 



209 



221 



195 



109 





43 



188 











68 





219 



232 



245 



237 



1*52 





60 



225 











*94 





275 



256 



275 



284 



194 





91 



284 











127 





359 





315 



334 



242 







363 



288 











140 



384 











176 





