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The avoirdupois pound, also known as the wool pound, first came into general use c. 1300. It was initially equal to 6992 troy grains. The pound avoirdupois was divided into 16 ounces. During the reign of Queen Elizabeth, the avoirdupois pound was redefined as 7,000 troy grains. Since then, the grain has often been considered as a part of the avoirdupois system. By 1758, two Elizabethan Exchequer standard weights for the avoirdupois pound existed, and when measured in troy grains they were found to be of 7,002 grains and 6,999 grains.[1][2]

Comparison of different English pounds

English pounds
Unit Pounds Ounces Grains Metric
metric Lond. avdp. merc. troy tower troy tower avdp. troy tower g kg
Metric 1 15/14 11/10 8/7 4/3 10/7 ≈ 16 ≈ 171/7 ≈ 173/5 ≈ 7716 ≈ 10974 500 1/2
London 14/15 1 36/35 16/15 5/4 4/3 15 16 1616/35 7200 10240 ≈ 467 7/15
Avoirdupois 10/11 35/36 1 28/27 175/144 35/27 147/12 155/9 16 7000 99555/9 ≈ 454 9/20
Merchant 7/8 15/16 27/28 1 75/64 5/4 141/16 15 153/7 6750 9600 ≈ 437 7/16
Troy 3/4 4/5 144/175 64/75 1 16/15 12 124/5 1329/175 5760 8192 ≈ 373 3/8
Tower 7/10 3/4 27/35 4/5 15/16 1 111/4 12 1212/35 5400 7680 ≈ 350 7/20

ReferencesEdit

  1. Skinner, F.G. (1952). "The English Yard and Pound Weight". Bulletin of the British Society for the History of Science 1 (7): 184–6. doi:10.1017/S0950563600000646. 
  2. United States. National Bureau of Standards (1962). weights and measures. Taylor & Francis. pp. 22–24. GGKEY:4KXNZ63BNUF. http://books.google.com/books?id=ycgOAAAAQAAJ&pg=PA22. Retrieved 26 December 2011. 

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