Here is a link to my 3X Great Grandfather's merchant seaman's ticket. On it, it shows the name of the ship he sailed on in 1847. The name is written twice, once for the outward bound voyage leaving London and once when it returned a year later.
I posted it on my blog:http://colonialfamily.wordpress.com/type/image/
If you have any ideas it would be great. When I know the name I can look up the crew list at Kew.
The crewman was Mr Richard HAMILTON b1826 who registered and served first as a midshipman on this voyage.