HMS Essex was a 64-gun third rate ship of the line

Ship of the line

A ship of the line was a type of naval warship constructed from the 17th through the mid-19th century to take part in the naval tactic known as the line of battle, in which two columns of opposing warships would manoeuvre to bring the greatest weight of broadside guns to bear...

 of the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

, launched on 28 August 1760 at Rotherhithe

Rotherhithe

Rotherhithe is a residential district in inner southeast London, England and part of the London Borough of Southwark. It is located on a peninsula on the south bank of the Thames, facing Wapping and the Isle of Dogs on the north bank, and is a part of the Docklands area...

.

She was on harbour service from 1777, and was sold out of the service in 1799.

Previously referenced picture depicting the cros-section of the HMS essex deck structure. http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Section_en_coupe_du_HMS_Essex.jpg/300px-Section_en_coupe_du_HMS_Essex.jpg