The triple gauge boson couplings between two W bosons and a photon have
been studied using photonic events with missing energy,
recorded with the OPAL detector at LEP.
Constraints on the gauge coupling parameters  
$\Delta \kappa_{\gamma}$ and $\lambda_{\gamma}$ have been determined
by fitting the differential cross section in bins of $E_\gamma$ and 
cos $\theta_\gamma$.