  We have measured the $WW\gamma$ gauge boson coupling parameters using
$p\bar{p}\to \ell\nu\gamma+X$ ($\ell=e,\mu$) events at $\sqrt{s}=1.8$ TeV. The
data, corresponding to an integrated luminosity of 89.1 pb^{-1}, were collected
using the D0 detector at the Fermilab Tevatron Collider. The measured cross
section times branching ratio for $p\bar{p} \to W\gamma+X$ with $p_T^\gamma$ >
10 GeV/c and $R_{\ell\gamma} > 0.7$ is ${11.8}^{+1.7}_{-1.6} \pm 2.0$ pb, in
agreement with the Standard Model prediction. The one degree of freedom 95%
confidence level limits on individual CP-conserving parameters are
$-0.98<\Delta\kappa<1.01$ and $-0.33<\lambda<0.31$. Similar limits are set on
the CP}violating coupling parameters.
