A snow rig was similar to a brig - two masts with square sails on each. It was distinguished from a brig by having an extra small mast fitted abaft the main lower mast. This was known as the trysail mast and was set with a spanker sail (fore-and-aft triangular sail). The snow rig was at one time common around the coasts of the UK but it is believed that the last one, the "Commerce" of Newhaven was built in 1862 and existed until 1909.
The SNOW rig is distinguished from the BRIG by the little mast which is fitted abaft the main lowermast. This photo shows the MILLIE
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