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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).

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).

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid in navigation. There is also an illustration featuring two Asian men depicted as native warriors, with a robed woman, as well as a large lizard.

This mid-18th century map of Asia has a stereographic projection to aid in navigation. There is also an illustration featuring two Asian men depicted as warriors, with a robed woman, as well as a large lizard.

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid in navigation. There is also an illustration featuring two Asian men depicted as warriors, with a robed woman, as well as a large lizard.

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid in navigation. There is also an illustration featuring two Asian men depicted as warriors, with a robed woman, as well as a large lizard.

Notes on this map describe European colonial territories and trade with Asia, though this is concentrated around India, and mostly has not yet reached further east to ‘India extra Gangem [India beyond the Ganges]’ as Southeast Asia is labelled.