Cojiiirr, Alii iiiiiiiini , (ind Lciiil. 



28rj 



is the "LosI Molioif. When ;i wire is strclciicd llic <iysliils liic.-ik dnwn and 

 arc (li-jiwii out ill llic diicclinii u[ llic Icii^itii i>\' llic wire, 'ilic aiiiuriilioiis 

 phase lliat is in-ddiiccd in tlic lircakdowii (ills up siicii (rcviccs as may he 

 (TPatcd i\w to llic disiiiacciiii'iit and Incakin;; ii|i nf liic crystals. Wlicn 

 Ilic stress is rciinivcd siicli crystals as remain intact caniiut return to tiieir 

 (iri.irinal iiesitidii hecaiisc (d' the presence of the ammplKMis phase. The 

 hr(.l<eii crystals have lest much of tlieir (dastic |.reperty. I'xdh .d" t lie.se 

 causes lend t() produce a pennanent sel or pernianent eloin;ation in llic 

 siiecimiMi. 



Acl<ii()\vlcd.Jicmcnt is made to I'rof. I.enion of Kyi-rson I'liysical i.ah(uatory 

 for liis su^'ficstions and ludp on this proidem. I am also indehted t(, Hie 

 riiysics Dcparlmcnl of ('hica.i:(p ruivcrsity wliiili pro\ided the e.iui|iment 

 neccssa ry. 



liihliof/rdplij/. 



1. E. N. da ('. Andrade. 'i'lie Idow in .Metals I'ndcr T-arKC rnnstant 

 Stresses. I'roc. Koy. Soc. Vol. :>(). pauc :'.•_".>. ]!»1 J. Als(. V<il. S4 of the 

 same puhlication. 



2. (J. QniiU'ko. Die S(diaumst ruUtiir der Mctallc. Inlcriiat. /eilacli. f. 

 Metal h)srai)liie III. 1 pa.s'c li.'!. UHli. 



;:. J. A. Ewiiif,' and Walter Kosenhain. The ("rystallinc Structure of Metals. 

 True. Koy. Soc. Vol. (i7 pase li:'.. IWO. 



4. (J. T. Beilhy. The Hard and Soft States in Ductile Metals. I'roc. Uoy. 

 Soc. Vol. 79, pa.se 40.'!. 19()7. 



5. A. A. Michelsoii. lUdiavi.n- of Sulistauces Under T(u-sion.— I'roc. Xafl 

 Acad. Se. 1017. 



