Diagonal scale

A diagonal scale

Diagonal scale is an engineering measuring instrument which is composed of a set of parallel straight lines which are obliquely crossed by another set of straight lines. Diagonal scales are used to measure small fractions of the unit of measurement.[1]


Diagonal scale is derived from the Latin word Diagonalis. The Latin word was originally coined from the Greek word diagōnios where dia means "through" and gonios denotes "corners".[1][2]

Principle of Diagonal scale

Diagonal scale follows the principle of similar triangles where a short length is divided into number of parts in which sides are proportional.[3]


Diagonal scale is used in engineering to read lengths with higher accuarcy as it represents a unit into three different multiple in metres, centimeters and millimeters.[4] Diagonal scale is an important part in Engineering drawings.[5]


  1. 1 2 Webster's Revised Unabridged Dictionary of the English Language: The Dictionary Proper Being the Authentic Ed. ... of 1890, to which is Now Added a Department of New Words Together with Many Valuable Special Features. Merriam-Webster. 1913.
  2. Davidson, Thomas (1907). Chambers's Twentieth Century Dictionary of the English Language. W. & R. Chambers Limited.
  3. "Types of Scales in Engineering Surveying | Civil Engineering Projects". 28 October 2011. Retrieved 26 September 2016.
  4. Khan, Md Zulfequar Ahmad. Text Book Of Practical Geography. Concept Publishing Company. p. 26. ISBN 9788170226826.
  5. Punmia, B. C. Surveying. Firewall Media. p. 11. ISBN 9788170088530. Retrieved 26 September 2016.

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