  We construct the effective anomaly lagrangian involving nucleons and photons
by using current-current coupling method. The contribution of this lagrangian
to the anomalous magnetic moment of nucleon is purely isovector. The anomalous
magnetic moment of proton, $\kappa_P$, can be calculated from the this
lagrangian and it is found to be $\kappa_P^{Theor.} = 1.77$, which is in
excellent agreement with the experimental value $\kappa_P^{Exp.} = 1.79$. While
the case of neutron, $\kappa_N^{Theor.} = -2.58$ as compared to
$\kappa_N^{Exp.} =-1.91$, is less satisfactory, but the sign is correct.
