Pair of ‘blue-backs’ of the English Channel

A pair of Dutch blue-back charts of the English Channel, showing Southern Ireland, the Scillys and Cornwall on the west sheet, and from Dartmouth east to Sheppey and London on the English side, and Morlais to Calais on the continent. Insets show details of Ramsgate, Cherbourg and Le Havre harbours. Along the bottom are longitude numerals marked off from both Greenwich and Tenerife. Originally published a few years earlier, this example has a pasted label with the 1805 date. At the time the Dutch were allies of the French: the following year Louis Bonaparte was made king of Holland. Van Keulen credits Cassini, Thomas Jefferys and John Hamilton Moore.