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The paper is a discussion of the many measures of distance commonly found on 17th century maps of Canada. Firstly, the measures are compared to each other in terms of commonly held notions about the length of a meridional degree. Secondly, an effort is made to ascertain the absolute length of the 17th century measures in terms of modern measures. Finally, some suggestions are made on how to ascertain the scale of a map and how to make scholarly use of it. Ce document est une étude des nombreuses mesures de distances habituellement utilisées sur les cartes du Canada du 17e siècle. En premier lieu, l'auteur se sert des notions habituellement admises au sujet de la longueur d'un degré de méridien pour comparer les mesures les unes aux autres. En second lieu, l'auteur tente de déterminer la longueur absolue des mesures du 17e siècle en termes de mesures modernes. Enfin, il apporte quelques suggestions sur la façon de déterminer l'échelle d'une carte et de l'utiliser en classe.
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