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BELL SYSTEM TECHNICAL JOURNAL 



Figs. 17, 18 — "Powder method " diffraction-rings obtained with X-rays and masses 

 of small crystals of a nickel-iron alloy built on a cubic lattice. The rings are uni- 

 formly dark for one sample because the crystals were oriented quite at random, 

 while for the other there were certain preferred orientations and the rings are 

 "spotted." (R. M. Bozorth.) 



