Thomas Jefferson Papers

VI. On Weights and Measures, [ca. April 1784]

VI. On Weights and Measures

The English foot is to the Parisian as 1000:1068

The English foot is such that a pendulum which vibrates in a second is 3f.3.2I. long

The English mile is 1760 yards = 5280 feet

An acre is 208.7 feet square. There are 640 acres in a square mile.1

The English use two kinds of pounds, viz the Avoirdupois and the Troy pound.

by the former they weigh heavy coarse commodities
by the latter they weigh gold and silver, medecines &c.

The French pound is to the Avoirdupois pound as 109:100

14. ℔ Avoirdupois are equal to 17 ℔ Troy

MS (Rijksarchief: Hogendorp Papers, The Hague); entirely in TJ’s hand except as noted below. Undated, but possibly drawn up for Hogendorp in Annapolis ca. April 1784.

1At this point the following is added in Hogendorp’s hand: “an english yard is three feet.”

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