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Russian Archin

The archin (also spelled arshin) is a traditional Russian unit of length that was widely used before the adoption of the metric system. It is approximately equal to 28 inches or 0.7112 meters.

The archin was commonly used in measuring cloth, land, and building dimensions in Russia and neighboring regions. It roughly corresponds to the length of a forearm from the elbow to the tip of the middle finger, similar to the cubit.

Though obsolete today, the archin remains an important part of Russian historical measurements and appears in older legal and trade documents.

Summary:

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  1 archin ≈ 28 inches (0.7112 meters)

  
  
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  Used historically in Russia for textiles and land measurement

  
  
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  Based on the length of the forearm

  
  
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  Mostly of historical and cultural interest today

  
  

Microinch

A microinch is a very small unit of length used primarily in precision engineering and manufacturing. It equals one-millionth of an inch (0.000001 inch), which is approximately 0.0254 micrometers (µm).

Microinches are used to measure extremely fine tolerances, surface finishes, and thicknesses in high-precision machining, electronics, and materials science.

Key facts:

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  1 microinch = 0.000001 inch

  
  
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  1 microinch ≈ 0.0254 micrometers (µm)

  
  
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  Used in precision engineering for very small measurements

  
  
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  Allows for accurate description of surface roughness and thickness

  
  

The microinch is essential in fields requiring ultra-fine measurements where standard units like the inch or millimeter are too large.