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Ell

An ell is a historical unit of length that was commonly used in medieval Europe, especially for measuring textiles and cloth. Its length varied by region but was typically about 45 inches (approximately 1.143 meters).

The ell originated from the length of the arm or forearm and was often used by tailors and merchants to measure fabric. Different countries had their own versions—for example, the English ell was about 45 inches, while the Scottish ell was longer, around 37 inches.

Although obsolete today, the ell played an important role in trade and clothing production before standardized measurements became widespread.

Summary:

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  1 ell ≈ 45 inches (1.143 meters)

  
  
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  Used mainly for measuring cloth and textiles

  
  
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  Length varied by region and country

  
  

The ell is now largely of historical interest but reflects the origins of many modern measurement systems.

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.