London:Measures
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The original ratio between corn and wine gallon is 9¼²:6·3½² = 1369:1176, but 268.8:231 <!--= 2<sup>6</sup>·3·5<sup>−1</sup>·7:3·7·11--> is exactly 64:55<!-- = 1.1(63)--> or ca. 13:11. This approximation is still applicable, although the ratio of 1.164 115 646 slightly changed to 1.163 647 186 with current definitions (268.8025:231 = 107521:92400 ~= 1344:1165). | The original ratio between corn and wine gallon is 9¼²:6·3½² = 1369:1176, but 268.8:231 <!--= 2<sup>6</sup>·3·5<sup>−1</sup>·7:3·7·11--> is exactly 64:55<!-- = 1.1(63)--> or ca. 13:11. This approximation is still applicable, although the ratio of 1.164 115 646 slightly changed to 1.163 647 186 with current definitions (268.8025:231 = 107521:92400 ~= 1344:1165). | ||
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Revision as of 12:22, 10 July 2006
1 foot | = | 1 1/3 span = 3 hands = 4 palms = 12'' [inches] = 120''' [lines] = 0.30479 m. |
1 mile | = | 8 furlongs = 80 chains = 1760 yards = 5280 feet = 1609.344 m. |
1 league | = | 3 miles = 4.828 km. |
1 wine gallon (1706) | = | 4 quarts = 8 pints = 231 cubic inches, i.e. 3.785 liters |
1 hogshead | = | 63 wine gallons = 238.455 liters |
1 quarter (dry quantities, 1696) | = | 2 combs = 4 strickes = 8 bushels = 32 pecks = 64 gallons = 128 pottles = 256 quarts = 516 pints = 281.9 dm³ |
1 pound [medical] | = | 12 ounces = 240 pennyweight = 373.24 g. [used for noble metals, and medicine] |
The wine gallon, which some sources relate to the volume occupied by eight medieval merchant pounds of wine, was at one time defined as the volume of a cylinder six inches deep and seven inches in diameter, i.e. 6·3½²·π = 230.90706 in³. It had been redefined during the reign of Queen Anne, in 1706, as 231 in³ exactly (3 × 7 × 11 in³), which is the result of the earlier definition with π approximated to 22⁄7. Although the wine gallon had been used for centuries for import duty purposes there was no legal standard of it in the Exchequer and a smaller gallon (224 in³) was actually in use, so this statute became necessary. It remains the U.S. definition today.
The original ratio between corn and wine gallon is 9¼²:6·3½² = 1369:1176, but 268.8:231 is exactly 64:55 or ca. 13:11. This approximation is still applicable, although the ratio of 1.164 115 646 slightly changed to 1.163 647 186 with current definitions (268.8025:231 = 107521:92400 ~= 1344:1165).