Fission-fragment anisotropy ratios, TF(170°)/P^(90°), from fission induced by 42.8-MeV helium ions, have been measured for the targets Th 230 , Th 232 , Pa 231 , U 233 , U 234 , U 235 , U 236 , U 238 , Np 237 , Pu 239 , Pu 240 , Pu 242 , Am 241 , Am 243 , Cm 244 , and Cf 249 . By modifying values of the fission-to-neutron level-width ratio Tf/T n from the literature, first-chance anisotropics were calculated to permit comparison of the targets at nearly uniform and rather high excitation energies. The resulting values of K

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