Fig. 7. Hyperfine pattern (second derivative curve) of the radical produced by 



x-irradiation of acetyl DL-valine. Marker spacing, 68 gauss. Observation 



frequency, 9 kMc. (From G. McCormick and W. Gordy (5).) 



Fig. 8. Resonances (first derivative curves) obtained for \-irradiatcd silk witii 



strands oriented parallel and perpendicular to the magnetic field. The obser\ation 



frequency is 23 kMc. (From W. Gordy and H. Shiklds (8).) 



