Here are some details of a book referred to earlier -
Paddle Warships - The Earliest Steam Powered Fighting Ships 1815-1850
Author: D.K. Brown,
ISBN: 0-85177-616-7
Publication Date: 1993
128 pages. 267 mm × 267 mm. Hard cover.
Published by Conway Maritime Press
This volume deals with the introduction of steam power into naval warfare in the form of paddle propulsion and includes a history of the vessels and the progress of naval steam through individual ships and classes. It also deals with general aspects of the ships, such as hull structure, machinery, paddle wheels, armament, internal arrangements and performance.
This is another of many books authored by David K. Brown, which is genuinely outstanding with high academic value but are also accessible to the amateur. David, who is genuinely recognised for his knowledge worldwide is to be congratulated for bringing the "mysteries" of warship design and development to non-technical layman.
David is a member of Royal Corp of Naval Constructors (RCNC), who are an elite band of Naval Architects being responsible for the design and support of a wide range of vessels built for the British Admiralty/Royal Navy,
Hope these extra notes may be useful to somebody