circumferentorn.

/səˈkʌmfərɛntə/

Forms: Also 1600s -er.

Etymology: < circumferent adj. + -or suffix, -er suffix¹ of the agent.

1. Surveying. An instrument consisting of a flat brass bar with sights at the ends and a circular brass box in the middle, containing a magnetic needle, which plays over a graduated circle; the whole being supported on a staff or tripod. (Now commonly superseded by the theodolite n.)

ΘΚΠ

the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for measuring angles

theodolite?a1560

topographical instrument?a1560

plain table1607

circumferentor1610

diopter1613

plane table1670

circumferencera1687

graphometer1696

semicircle1701

transit theodolite1824

dioptric1849

planchette1858

theodolite-goniometer1909

gyro-theodolite1950

1610 W. Folkingham Feudigraphia ii. iv. 53 With Plaine-Table, Theodelite, Sector, Circumferentor.

1647 N. Nye Art of Gunnery ii. 36 Circumferenter, or Geometricall Square.

1697 Philos. Trans. 1695–7 (Royal Soc.) 19 625 The Circumferentor, by which the Down Survey, or Sir William Petty's Survey of Ireland was taken.

1760 S. Wyld (title) The Practical Surveyor, by the Plain-Table, Theodolite, or Circumferentor.

1864 J. C. Jeaffreson R. Stephenson I. 48 (L.).

2. An instrument for measuring the circumference of a wheel; a tire-measurer, tire-circle.

ΚΠ

1874 in E. H. Knight Pract. Dict. Mech.

This entry has not yet been fully updated (first published 1889; most recently modified version published online December 2020).

单词	circumferentor
释义	circumferentorn. /səˈkʌmfərɛntə/ Forms: Also 1600s -er. Etymology: < circumferent adj. + -or suffix, -er suffix¹ of the agent. 1. Surveying. An instrument consisting of a flat brass bar with sights at the ends and a circular brass box in the middle, containing a magnetic needle, which plays over a graduated circle; the whole being supported on a staff or tripod. (Now commonly superseded by the theodolite n.) ΘΚΠ the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for measuring angles theodolite?a1560 topographical instrument?a1560 plain table1607 circumferentor1610 diopter1613 plane table1670 circumferencera1687 graphometer1696 semicircle1701 transit theodolite1824 dioptric1849 planchette1858 theodolite-goniometer1909 gyro-theodolite1950 1610 W. Folkingham Feudigraphia ii. iv. 53 With Plaine-Table, Theodelite, Sector, Circumferentor. 1647 N. Nye Art of Gunnery ii. 36 Circumferenter, or Geometricall Square. 1697 Philos. Trans. 1695–7 (Royal Soc.) 19 625 The Circumferentor, by which the Down Survey, or Sir William Petty's Survey of Ireland was taken. 1760 S. Wyld (title) The Practical Surveyor, by the Plain-Table, Theodolite, or Circumferentor. 1864 J. C. Jeaffreson R. Stephenson I. 48 (L.). 2. An instrument for measuring the circumference of a wheel; a tire-measurer, tire-circle. ΚΠ 1874 in E. H. Knight Pract. Dict. Mech. This entry has not yet been fully updated (first published 1889; most recently modified version published online December 2020). < n.1610
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