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Span (Cloth)


A span is an old unit of length based on the distance between the tip of the thumb and the tip of the little finger of a fully extended hand. Traditionally, it measures about 9 inches or 22.86 centimeters.


In the context of cloth and textiles, the span was used as a convenient, informal measure to estimate small lengths of fabric before standardized rulers became widespread. It was helpful for tailors and traders to quickly gauge lengths during measuring and cutting.


While the span is largely obsolete as a formal unit today, it reflects historical measurement practices tied closely to the human body, similar to the cubit or hand.


Summary:



  • 1 span β‰ˆ 9 inches (22.86 cm)



  • Based on the hand’s spread



  • Used historically in cloth measurement and tailoring



  • Now mostly of historical and cultural interest


Caliber


Caliber is a term used to describe the internal diameter of a cylindrical object, most commonly the inside diameter of a gun barrel or firearm bore. It is typically measured in inches or millimeters.



  • In firearms, caliber indicates the diameter of the bullet or projectile that can be fired from the barrel (e.g., a .45 caliber means the barrel’s internal diameter is 0.45 inches).



  • In other contexts, such as engineering or piping, caliber can refer more generally to the diameter or thickness of tubes or cylindrical objects.



Key points:



  • Caliber = internal diameter of a barrel or tube



  • Measured in inches or millimeters



  • Important for firearm specifications and ammunition compatibility



  • Also used in engineering and manufacturing



Caliber is crucial for matching ammunition to firearms and for defining performance characteristics like velocity and accuracy.




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