sentences:  After serving an apprenticeship with the Hunter and English company, he joined the engineering department of Trinity House, the United Kingdom's lighthouse authority.Along with his brother William, James worked as an assistant to his father during the construction of James Walker's Bishop Rock Lighthouse, earning the nickname 'Cap'n Jim' during the process.After a brief period working for the Newcastle carriage builders R J & R Laycock, he returned in 1854 to assist in the lighthouse's final completion and to marry his fiancee Mary Tregarthen.