'Ueber Signal, Order, and Ziel-schreiberie in die ferne...', 1795.
German printed book: 'Ueber Signal, Order, and Ziel-schreiberie in die ferne...', 1795, with fold-out illustrations of semaphore and telegraph signal stations
National Maritime Museum, Greenwich, London. Purchased with the assistance of the Heritage Lottery Fund and the Society for Nautical Research Macpherson Fund, 2004