sentences:  At the age of thirteen in 1771, Harvey was entered onto the books of the naval schooner HMS "Mary", although he did not actually serve aboard the ship.Utilising a standard legal fiction of the time, Harvey's name was entered on the ship's books without his actual presence, a ruse that would provide him with sufficient seniority to gain rapid promotion when he did enter the navy.In his summer holidays from school, Harvey served at sea, joining HMS "Orpheus" in 1773.