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Difficulty: Very hardPrimary Purpose of the Whole Text

Gerardus Mercator’s 1569 world map is frequently censured by modern educators for distorting the relative scale of landmasses, notably exaggerating high-latitude regions while shrinking equatorial zones. However, evaluating the projection through the lens of modern geographic accuracy misconstrues Mercator’s design intent; his primary objective was to resolve a critical navigational challenge of the age of sail. By projecting lines of constant bearing—loxodromes—as straight coordinates, Mercator enabled mariners to plot a course simply by drawing a line between two points and measuring the angle relative to the meridians. Consequently, the projection's distortion of area was not a structural failure, but a necessary mathematical compromise designed to serve a highly specialized nautical function rather than an educational overview.

Which choice best states the primary purpose of the text?

  1. A
    To describe how the navigational demands of the age of sail transformed the field of cartography by requiring more functional world maps.
  2. B
    To explain how drawing straight lines representing loxodromes allows sailors to determine constant bearings between two points.
  3. To argue that contemporary criticisms of Mercator's map projection overlook the specific navigational utility it was intentionally designed to provide.Answer
  4. D
    To dispute the claim that Mercator's map projection distorts the relative sizes of equatorial and high-latitude landmasses.

Answer

The primary purpose of the text is to argue that contemporary criticisms of Mercator's map projection overlook the specific navigational utility it was intentionally designed to provide.
The author introduces a modern criticism of Mercator's map—that it distorts landmass sizes—and argues that this criticism misinterprets the map's goal. By explaining that the projection was explicitly designed to help sailors plot a straight-line course (using loxodromes) and concluding that this distortion was a necessary trade-off for its nautical function, the author's main objective is to defend the map against modern critiques by emphasizing its intended purpose.

Step-by-Step Solution

1
Identify the main argument and topic introduction.
The text introduces a common criticism of Mercator's map (distortion of landmasses) and immediately transitions to a counterargument stating that evaluating the map based on spatial accuracy misconstrues Mercator's design intent.
This establishes the rhetorical framing of the passage: challenging modern criticisms of the map.
2
Analyze the supporting evidence and contextual details.
The text explains how the projection uses straight lines representing loxodromes to help sailors easily navigate by drawing straight lines between coordinates.
This explains the specific practical problem Mercator intended to solve, justifying the design compromises he made.
3
Synthesize the conclusion to determine the author's primary objective.
The author concludes that the distortion of landmass sizes was not a structural failure but a necessary compromise to achieve a specialized nautical function.
By linking the opening counterargument to the final defense of the map's functional utility, the primary purpose is to argue that criticisms regarding scale distortion miss the point of its design.

Key Concept

Identifying the primary purpose of a whole text requires looking past individual details (such as the explanation of loxodromes) or broad generalizations (such as shifts in global cartography) to find the overarching argument the author is making throughout the passage.
Estimated Time:2m 0s
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Primary Purpose of the Whole Text

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