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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.

This two-sheet map of Asia features a decorative cartouche with drawings of two women holding censers (incense burners), two cherubs, and a French coat of arms. On the map, mountains and forests are represented pictorially.