Single W boson production in electron-positron collisions is analysed
with the L3 detector at LEP.  Events with a single energetic lepton or
two hadronic jets visible in the detector are selected.  The total
cross-sections are measured and found to be consistent with the
Standard Model expectation.  Including our single W boson results
obtained at lower $\sqrt{s}$ the $WW\gamma$ gauge couplings $\kappa_\gamma$ and
$\lambda_\gamma$ are determined.