Robert Dobson b. 1835 at Liverpool. Worked as a Shipwright at Liverpool. He was located in 1861 census working on board HMS Cossack at Portsmouth harbour. He has not been found in the 1871 census
His wife remarried in 1875. It is believed he died between 1871 and 1875. but no trace of his death has been found.
Was he a civilian employee or a Naval employee ?
All clues, hints welcome