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单词 null-point
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null-point
null-point n. (a) a point associated with or having the value zero, or at which opposing forces cancel each other out; (b) Mechanics and Geometry. [after German Nullpunkt (A. F. Möbius Lehrb. der Statik (1837) I. vi. 144)] the point of intersection of all the null lines of a given torque that lie in a given plane.
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the world > relative properties > relationship > equality or equivalence > [noun] > equilibrium > balancing point
null-point1818
1818 S. T. Coleridge Friend III. i. iv. 150 Confusion and formality are but the opposite poles of the same null-point.
1851 J. P. Nichol Archit. Heavens (ed. 9) 208 The centre of gravity and motion, being the mere point where all opposite tendencies find their balance—the system's null point.
1903 C. M. Jessop Treat. Line Complex iii. 45 The distinction between the two spaces Σ and Σ′ has now disappeared and we have a (1, 1) correspondence between the points and planes of space in which each point lies in its corresponding plane... Such a correspondence is called a null-system. The corresponding points and planes are called ‘null-points’ and ‘null-planes’.
1974 V. B. Mountcastle et al. Med. Physiol. (ed. 13) I. v. 169/1 Diagram summarizing results obtained by means of null-point experiment.
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