Source : Webster's Revised Unabridged Dictionary (1913)

Vapor galvanizing \Va"por gal"va*niz`ing\ (Metal.)
   A process for coating metal (usually iron or steel) surfaces
   with zinc by exposing them to the vapor of zinc instead of,
   as in ordinary galvanizing, to molten zinc; -- called also
   {Sherardizing}. Vapor galvanizing is accomplished by heating
   the articles to be galvanized together with zinc dust in an
   air tight receptacle to a temperature of about 600[deg] F.,
   which is 188[deg] below the melting point of zinc, or by
   exposing the articles to vapor from molten zinc in a separate
   receptacle, using hydrogen or other reducing gas to prevent
   oxidation.