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Longitude is indicated in two different ways on this mid-18th century map: along the top border, it is shown in degrees (number of degrees east of London); more unusually, along the bottom border, it is shown in time (number of hours east of London).

A late 18th century map of Asia with regions divided by colour-coded borders, and detailing rivers, mountains, reefs and shoals.

Map charting the three expeditions of the British Royal Navy captain James Cook, including HMS Endeavour’s journey via Batavia (Jakarta) in 1770, and HMS Resolution’s journey through the South China Sea (after Cook’s death) in 1779.

Maritime routes had to be adjusted in response to the changing monsoon seasons, as is seen on this late 18th century map of the Indian Ocean. Drawings of the heads of children blowing—called ‘wind-heads’—are used to indicate wind direction.

Two maps of the Indian Ocean showing currents (represented by arrows) and winds (represented by letters A to F) during the monsoon seasons. Three routes—one old and two new—from the Isle de France (Mauritius) east to the Strait of Malacca are shown.

Map of Asia, with mainland Southeast Asia in red and divided into ancient kingdoms, Sunda Islands in yellow, and the Philippines in grey. Twelve different scales are shown, as different countries used different measurement systems.

Map of Asia, with mainland Southeast Asia in red and divided into ancient kingdoms, Sunda Islands in yellow, and the Philippines in grey. Twelve different scales are shown, as different countries used different measurement systems.

This map of Asia features a decorative cartouche with drawings of two women—one with a cornucopia and one with a censer (incense burner)—and a French coat of arms. Interestingly, the map is dated 1792, during the French Revolution.

A late 18th century maritime map of Southeast Asia, marked with expedition routes including the return of Captain Cook’s HMS Endeavour from Australia in 1770, and Captain Philip Carteret’s circumnavigation expedition in 1768.

A simple hand-coloured map of Asia, with a cartouche of shell, leaves and plants. It shows that in the late 18th century, the details of New Guinea and Australia (‘Nieuw Holland’) were uncertain.

This map of Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.

A simple hand-coloured map of Asia, with a cartouche of shell, leaves and plants. It shows that in the late 18th century, the details of New Guinea and Australia (‘Nieuw Holland’) were uncertain.