Abstract
The expressions for the mean spatial and projected angles of multiple scattering are obtained using the distribution function for multiple scattering derived by Nigam, Sundaresan and Wu, and compared with those of Moli\`ere. It is shown that Moli\`ere's calculations involve the approximation of ${\ensuremath{\chi}}_{c}\ensuremath{\surd}B\ensuremath{\rightarrow}0$. The distribution function of Nigam et al. is found to give correction terms which are proportional to powers of ${\ensuremath{\chi}}_{c}\ensuremath{\surd}B$ and ${\ensuremath{\chi}}_{c}\ensuremath{\surd}B\mathrm{ln}(\frac{\ensuremath{\pi}}{{\ensuremath{\chi}}_{c}\ensuremath{\surd}B})$.
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