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Fathom (US Survey)


The fathom (US survey) is a unit of length used in U.S. surveying and nautical contexts, defined as exactly 6 US survey feet. Since one US survey foot is approximately 0.3048006096 meters, the US survey fathom measures about 1.828804 meters.


Like the international fathom, it is primarily used to measure water depths and underwater distances in marine navigation and surveying.


Key details:



  • 1 US survey fathom = 6 US survey feet



  • 1 US survey fathom ≈ 1.828804 meters



  • 1 fathom = 2 yards



Though the difference between the US survey fathom and the international fathom is very small, the US survey units are being phased out in favor of international standards, but they still appear in some legal and historical surveying documents.



Hand


A hand is a traditional unit of length primarily used to measure the height of horses. It is equal to 4 inches or 10.16 centimeters.


The origin of the hand as a measurement comes from using the width of a human hand, and it has been standardized at 4 inches for consistency in horse measurement. Horse height is expressed in "hands," measured from the ground to the highest point of the withers (the ridge between the shoulder blades).


Key points:



  • 1 hand = 4 inches



  • 1 hand = 10.16 centimeters



  • Used mainly for measuring horse height



  • Horse height is often given in hands and inches, e.g., 15.2 hands means 15 hands plus 2 inches



The hand remains the standard unit for horse height in many English-speaking countries.



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