anallaticadj.

Brit.

/anəˈlatɪk/, U.S.

/ænəˈlædɪk/

Forms: 1800s– anallatic, 1900s– anallactic.

Origin: A borrowing from French. Etymon: French anallatique.

Etymology: < French anallatique (1849 or earlier; < Hellenistic Greek ἀνάλλακτος unchangeable (see anallatism n.) + French -ique -ic suffix, after anallatisme anallatism n.), with remodelling of the ending after -ic suffix. Compare anallatism n.In form anallactic after Hellenistic Greek ἀνάλλακτος.

Surveying.

Of a surveying telescope: having an additional lens between the eyepiece and the object lens, positioned to enable the horizontal distance to be calculated from the slant distance without the need for a correcting factor; (of a lens) serving to make a telescope anallatic.

ΚΠ

1888 Minutes Proc. Inst. Civil Engineers 91 286 The rays after passing through this third lens become parallel, whilst the sizes of objects subtending the same angle at the centre of ‘anallatism’, or unchangeableness, are proportional to their distance from that point. This point being placed in the vertical axis of the instrument, the telescope is rendered anallatic.

1911 Trans. Optical Soc. 13 217 To avoid the error from neglecting this factor, the so-called anallatic lenses are made.

1950 Brit. Patent 644,982 4/2 A formula analogous to that for range-finding with anallactic telescope.

1984 W. Schofield Engin. Surv. (ed. 3) I. v. 128 All modern internal focusing telescopes, although not strictly anallactic may be regarded as so.

2001 U.S. Patent 6,226,076 B1 10 The collimation optical system is constituted by an eyepiece, a reticle (focusing screen), an erect prism (Porro prism), the focusing lens (anallatic lens), and the objective lens.

This is a new entry (OED Third Edition, November 2010; most recently modified version published online December 2021).

单词	anallatic
释义	anallaticadj. Brit. /anəˈlatɪk/, U.S. /ænəˈlædɪk/ Forms: 1800s– anallatic, 1900s– anallactic. Origin: A borrowing from French. Etymon: French anallatique. Etymology: < French anallatique (1849 or earlier; < Hellenistic Greek ἀνάλλακτος unchangeable (see anallatism n.) + French -ique -ic suffix, after anallatisme anallatism n.), with remodelling of the ending after -ic suffix. Compare anallatism n.In form anallactic after Hellenistic Greek ἀνάλλακτος. Surveying. Of a surveying telescope: having an additional lens between the eyepiece and the object lens, positioned to enable the horizontal distance to be calculated from the slant distance without the need for a correcting factor; (of a lens) serving to make a telescope anallatic. ΚΠ 1888 Minutes Proc. Inst. Civil Engineers 91 286 The rays after passing through this third lens become parallel, whilst the sizes of objects subtending the same angle at the centre of ‘anallatism’, or unchangeableness, are proportional to their distance from that point. This point being placed in the vertical axis of the instrument, the telescope is rendered anallatic. 1911 Trans. Optical Soc. 13 217 To avoid the error from neglecting this factor, the so-called anallatic lenses are made. 1950 Brit. Patent 644,982 4/2 A formula analogous to that for range-finding with anallactic telescope. 1984 W. Schofield Engin. Surv. (ed. 3) I. v. 128 All modern internal focusing telescopes, although not strictly anallactic may be regarded as so. 2001 U.S. Patent 6,226,076 B1 10 The collimation optical system is constituted by an eyepiece, a reticle (focusing screen), an erect prism (Porro prism), the focusing lens (anallatic lens), and the objective lens. This is a new entry (OED Third Edition, November 2010; most recently modified version published online December 2021). < adj.1888
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