This was in Nelson's Dockyard's museum.
THE BRITISH NAVAL BRIG "DIANA"
"Built in around 1840.
On permanent loan from the National Maritime Museum, Greenwich, England."
BRIGS
"Brigs are similar to schooners but, unlike schooners, their mainmasts are taller than their foremasts. They also have square-rigged sails on both masts, as well as a fore-and-aft sail on the main."