Traveling Back in Time With Colorful Isochrone Maps

Journey-based charts from the past can help us track the progression of transportation technology.

In the early 1880s, the mapmaker Francis Galton began to imagine a series of ideal trips. Each started in his home city, London, but from there they ranged far afield—to Greenland, or Morocco, or the distant reaches of the Pacific. By figuring out how long each of these trips would take, and drawing lines grouping those destinations that could be reached in an equal amount of time, he figured he could provide a service to travelers, sailors, and those who simply wanted to know how long it would take their mail to get someplace … isochrone maps

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