There a three documents on Ancestry for the navy records for a Simeon Ruby for:-
1845-1855 Crimean War - ship Belleisle
http://search.ancestry.co.uk/cgi-bin...251&recoff=4+5
1856-1860 Second China War - ship Esk
http://search.ancestry.co.uk/cgi-bin...322&recoff=4+5
1873-1874 Third Ashanti War - ship Active
http://search.ancestry.co.uk/cgi-bin...298&recoff=4+5
Edit to say: put links in don't know if it's your Simeon not sure how you would tell without other documentation also I have only just seen your other thread about not being able to find the census.