622 



MOTONORI MATSUYAMA 



approximation seems safe. This steepness of the former curves 

 means that ice is more easily twisted when the constituent crystals 

 are arranged transverse to the rod than when they are parallel to 

 its axis. 



60 



40 



¥1 — \ — I — I — I — i — I — I — T — 1 — ~1 — I — i — 1 — I — ' — i — I — I — 1 — I — I — 



JS 



_-^-J, 



IZI^ZIIZZZk 



o 2 4 6 8 10 12 



Torsion in degrees 



Fig. 9. — Recovery curve for the rod with crystals transverse to its longer dimen- 

 sion. Crosses for constant force and dots for increasing force. 



_L — ji 



1~ ir ~™"~ *■■■■" ii^^i^ ~ ' 



'-' 60 



rt 40 



Ph 20 



o 2 4 6 8 10 12 14 16 iS 20 22 



Torsion in degrees 



Fig. id. — Recovery curve for the rod with crystals parallel to its axis. Crosses 

 for constant force and dots for increasing force. 



RECOVERY FROM DEFORMATION 



While observing the deformations by constant force as well as 

 by increasing force, the amount of return toward the original state 



