spider-linen.

Forms: Also spider's line.

Etymology: spider n.

One of the threads or filaments of spider-web used to form the reticle of various optical instruments, esp. of micrometers, and serving to obtain minute measurements; also loosely, any slender thread or wire used for this purpose.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > [noun] > instrument for looking through > parts of

sight-hole1559

aperture1665

diaphragm1665

reticule1728

reticle1731

wire1737

web1746

screena1764

eye cap1822

spider-line1829

cobweb1837

slit1863

society > occupation and work > materials > raw material > other animal raw materials > [noun] > cobweb

web1746

spider-line1829

cobweb1837

cross-wire1866

1829 W. Pearson Pract. Astron. II. 323 The spider's lines, or wires, are usually paid parallel to one another on a circular plate of brass.

1866 Parkinson Optics (ed. 2) 209 Such a set of threads are commonly called cross-wires or spider lines.

1888 F. Rutley Rock-forming Minerals 14 Within the focus of the eye-glass, two fine wires or spider-lines are inserted.

attributive.1829 W. Pearson Pract. Astron. II. 245 Binocular Spider's-line and Glass-disc Micrometers.1875 E. H. Knight Amer. Mech. Dict. II. 1431/1 A substitute for the spider-line micro~meter.

This entry has not yet been fully updated (first published 1914; most recently modified version published online December 2021).

单词	spider-line
释义	spider-linen. Forms: Also spider's line. Etymology: spider n. One of the threads or filaments of spider-web used to form the reticle of various optical instruments, esp. of micrometers, and serving to obtain minute measurements; also loosely, any slender thread or wire used for this purpose. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > [noun] > instrument for looking through > parts of sight-hole1559 aperture1665 diaphragm1665 reticule1728 reticle1731 wire1737 web1746 screena1764 eye cap1822 spider-line1829 cobweb1837 slit1863 society > occupation and work > materials > raw material > other animal raw materials > [noun] > cobweb web1746 spider-line1829 cobweb1837 cross-wire1866 1829 W. Pearson Pract. Astron. II. 323 The spider's lines, or wires, are usually paid parallel to one another on a circular plate of brass. 1866 Parkinson Optics (ed. 2) 209 Such a set of threads are commonly called cross-wires or spider lines. 1888 F. Rutley Rock-forming Minerals 14 Within the focus of the eye-glass, two fine wires or spider-lines are inserted. attributive.1829 W. Pearson Pract. Astron. II. 245 Binocular Spider's-line and Glass-disc Micrometers.1875 E. H. Knight Amer. Mech. Dict. II. 1431/1 A substitute for the spider-line micro~meter. This entry has not yet been fully updated (first published 1914; most recently modified version published online December 2021). < n.1829
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