Table:
text: Royal Mail Steam Packet Company
List of RMSP Company vessels
List of RMSP Company vessels
Ship Date_Commissioned Gross_Tonnage Propulsion Material
Actaeon 1842 650 Paddle Wood
Avon 1842 2069 Paddle Wood
City of Glasgow 1842 1700 Paddle Wood
Clyde 1842 1841 Paddle Wood
Dee 1842 1849 Paddle Wood
Forth 1842 1900 Paddle Wood
Isis 1842 1900 Paddle Wood
Larne 1842 300 Schooner Wood
Lee 1842 250 Schooner Wood
Liffey 1842 350 Schooner Wood
Medina 1842 1800 Paddle Wood
Medway 1842 1895 Paddle Wood
Severn 1842 1886 Paddle Wood
Solway 1842 1700 Paddle Wood
Tay 1842 1858 Paddle Wood
Teviot 1842 1744 Paddle Wood
Thames 1842 1889 Paddle Wood
Trent 1842 1856 Paddle Wood
Tweed 1842 1800 Paddle Wood

Question: When did the Royal Mail Steam Packet Company tell me total gross tonnage for the isis ship on date commissioned before 1842?