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'precise evidence on the map' is lacking; true enough. In fact, the evidence lies
elsewhere, and I shall return to it in the final chapter of this topic.
Regardless of whether these calculations work, I am cautiously certain that the
rulerandcompassareonthemapastell-talesignsthattheSeldencartographerhad
seen European sea charts and realised that he could borrow them to excellent ef-
fect. They are not purely decorative touches aping the look of a European chart,
however, for by transferring this technology to his own production, the Selden car-
tographer then did what no European cartographer had ever attempted. Rather like
John Selden who could imagine lines of jurisdiction over water, he drew the routes
of merchant ships over the moving face of the sea.
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