| 单词 | pressure figure |
| 释义 | > as lemmaspressure figure pressure figure n. [with spec. use in mineralogy compare German Druckfigur (1897 or earlier); compare also percussion figure n. at percussion n. Compounds 2] †(a) a shape that corresponds to some situation defined in terms of pressure (obsolete); (b) Mineralogy a pattern of cracks formed on the surface of a mineral by applying steady pressure at a point.Sense (a) apparently represents an isolated use. ΚΠ 1884 Proc. Royal Soc. 1883–4 36 226 We may determine the pressure-figure, or form, which the wheat assumes in the cell. 1890 Cent. Dict. Pressure-figure, a figure produced in a section of some minerals by the pressure of a rather sharp point. 1963 Jrnl. Geol. (Chicago) 71 581 Closely spaced planar features occur which are parallel with {1101} and {0001}. These features..are parallel with the sides of the pressure figures produced by Shubnikov and Zinserling with a spherical indenter. 2002 C. Cipriani in A. Mottana et al. Micas xii. 484 In crystals without crystal shape, distinction was made by means of ‘percussion figures’.., a method introduced by Rensch in 1868... A few years later in 1873, Rensch also produced ‘pressure figures’ (with a pencil point rounded into a hemisphere). < as lemmas |
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