Third-rate

This article is about Royal Navy ships of the line. For the adjective meaning that something is of inferior quality, see wikt:third-rate. For the rating of late Georgian and early Victorian buildings, see Building Act 1774.

The third-rate HMS Buckingham on the stocks before its launch in 1751

Painting of the third-rate HMS Melville

In the rating system of the Royal Navy, a third-rate was a ship of the line which from the 1720s mounted between 64 and 80 guns, typically built with two gun decks (thus the related term two-decker).