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A shrunk scale is required where

  • A.angles must be measured without a protractor
  • B.the drawing sheet or survey chain has altered in length
  • C.the object is too large to be drawn full size
  • D.three successive units must be read from one scale

Answer: B

Correct answer: the drawing sheet or survey chain has altered in length

A shrunk scale corrects for a physical change in the measuring medium. Paper contracts with age and changes in humidity, and a survey chain stretches with use, so lengths taken from the one or recorded with the other are no longer what they purport to be. The shrunk scale builds the correction into the graduations.

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