00 Messrs. K. Honda and T. Terada on the Change of 



Thus the proportionality is nearly satisfied up to J 00 grams ; 

 this also shows that the friction at different parts of the 

 arrangement is neolioiblv small. 



The coefficient of elasticity differed slightly for different 

 initial tensions, and moreover underwent more or less 

 hysteresis due to the previous load. In our experiments, the 

 weights were varied from 1 to 7 kilograms, and then again 

 down to 1 kilogram. The results are tabulated in the 

 following table : — 



Table XXIII. 



4 = 12° 0. 



Pure Nickel. 



Commercial Kick el. 



• Swedish Iron. 



Tungsten-Steel. 



gr./mru. 2 



Ex 



1 



]0~ 12 . 



gr./mm. 2 



ExlO -12 . 



gr./rnm. 2 



ExlO- 12 - 



gr. mi 

 1756 



n. 2 ExlO" 12 . 



1 



1599 



•708 



1376 



1-818 



1689 



1-802 



5 1-928 



3080 



l-76<> 



2651 



1-972 



3254 



1-883 



338( 



> 1-938 



4557 



1-835 



3923 



2 049 



4815 



1-916 



501] 



L 1-938 



6040 



1-854 



5199 



2125 



6380 



1-947 



6641 



) ; 1-955 



7523 



1-867 



6477 



2-152 



7947 



1-955 



8:7: 



2 1-949 



9003 



1-887 



7750 



2193 



9511 



1-962 



990( 



) 1951 



10480 



1-002 



9023 



2212 



11700 



i-968 



1152, 



3 1-945 



7523 



1-888 







7947 



1-935 



827: 



>. 1-937 



4557 



1-851 



5199 



2446 



4815 



1-919 



501 



L 1-923 



1599 



1-739 



1376 



1-851 



1689 



1-783 



175c 



3 1914 



28"74 



: per cent. '. 



Si. 





50-72 pe 



* cent. Ni. 



70-32 peL 



cent. Ni. 



gr./mm 





Exl 





*r./mra. 2 



ExlO* 



V2 



gr./mm. 2 



EX10- 12 . | 



1480 





1-570 





1780 



1376 





1500 



1-866 



2850 





1-619 















4220 





1-643 





5070 



1-551 





4260 



1-982 



5600 





1-667 















6970 





1-677 



8370 



1-621 





7030 



1-996 



8340 





1-693 









... 





9710 





1-702 



11650 



1-619 



9800 



1-992 



6970 





1-675 



8370 



1-567 



7030 



1-936 



4220 





1-666 



5070 



1-548 



1 4260 



1-961 



1480 





1-591 



1780 



1-377 



1500 



1864 



The mean curves corresponding to these numbers are given 

 in PI. II. figs. 19, 20, 21, 22, 23, 21 and 25. They are drawn 

 on a very exaggerated scale. They show distinct hysteresis ; in 

 three of them, the 



seen ding branch lie; 



below the descending: 



