Scale 1:48. Plan showing the inboard profile plan for Spartan (1841), Creole (1845), Amethyst (1844), Niobe (1849), all 28-gun Sixth Rate ships. Spartan (1841) was later deleted, once built as modifications to rake of stern and the masts relate to 18413 onwards. Amethyst (1844) and Niobe (1849) were added in 1841.This was prior to Niobe (1849) being re-ordered as one of the Diamond class Sixth Rates in March 1846. Signed W[illiam] Symonds (Surveyor of the Navy)