The John Williamson was an overseer in the mines at Wanlockhead so I don't think he was the one that went to sea. Robert Reid was a Lead Miner. It says on the proclamation of marriage that she was born in Kent.
The children were Caroline, Harriet, Mary Ann (my gg grandmother) Margaret (married in 1841 and went to Austrlia with her husband), Elizabeth married ad lived in Edinburgh and John (Cannot find any trace of him. Have a list of deaths of John Williamson that I am going to look up when I go to Scotlands People.