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Foot (US Survey)


The US survey foot is a unit of length used historically in the United States for land surveying and mapping. It is defined as exactly 1200/3937 meters, which is approximately 0.3048006096 meters. This makes it very slightly longer than the international foot, which is exactly 0.3048 meters.


The US survey foot was established to maintain consistency with earlier land surveys and legal descriptions in the U.S. It was used extensively in the Public Land Survey System and other cadastral surveys.


Key points:



  • 1 US survey foot = 1200/3937 meters β‰ˆ 0.3048006096 meters



  • Slightly longer than the international foot by about 0.0006 millimeters



  • Used primarily in land surveying and legal documents



  • As of recent years, the US has been phasing out the US survey foot in favor of the international foot for standardization.



Though nearly identical to the international foot, the US survey foot remains important for understanding older land records and measurements.


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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