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The ferromagnetic exchange constant has been measured using spin wave resonance in a number of iron-nickel alloys covering the composition range 60% to 90% nickel. The exchange constant varies smoothly from a value of 1.3 (10-6) erg . cm-1at 60% Ni to an extrapolated value of 0.77 (10-6) at 100% Ni. The data are in significant disagreement with the values published by Rusov.