| 单词 |
duodecimal |
| 释义 |
duodecimal, a. and n.|djuːəʊˈdɛsɪməl|
[f. L. duodecim-us twelfth, f. duodecim twelve: see -al1. Cf. F. duodécimal (1801 Hauy).]
A. adj. Relating to twelfth parts or to the number twelve; proceeding by twelves.
1727J. Jordaine (title) Duodecimal Arithmetick and Mensuration improved. 1749F. Smith Voy. Disc. II. 56 A duodecimal Progression. 1857Sat. Rev. III. 448/1 A strictly duodecimal coinage.
B. n. pl. duodecimals, a method of multiplying together quantities denoting lengths given in feet, inches, twelfths of an inch, etc., without reducing them to one denomination; also called cross-multiplication.
The method is essentially that of long multiplication, but in the duodecimal scale instead of the decimal. The successive terms of the result denote square feet, twelfths of a square foot, square inches, etc.
1714S. Cunn (title) A new and complete Treatise of the Doctrine of Fractions..with an Epitome of Duodecimals. 1802P. Barlow (title) On the Method of Transforming a Number from one Scale of Notation to another, and its Application to the rule of Duodecimals. 1859Barn. Smith Arith. & Algebra (ed. 6) 167 This method is styled Cross Multiplication or Duodecimals, and it is generally employed by painters, bricklayers, &c., in measuring work.
Hence duoˈdecimally adv.
1847Craig, Duodecimally, by duodecimals. |
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