peractorn.

Brit.

/pəˈraktə/, U.S.

/pəˈræktər/

Forms: 1600s 1800s– peractor, 1700s peracter.

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin peract- , peragere , -or suffix.

Etymology: < classical Latin peract-, past participial stem of peragere peract v. + -or suffix. Compare post-classical Latin peractor a person who accomplishes (first half of the 16th cent.).With the form peracter compare -er suffix¹.

Surveying. Now historical.

A kind of theodolite (see quot. 1674).

ΘΚΠ

the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > other surveying instruments

quadrat?c1400

trigon1590

square1600

peractor1616

definitor1664

Marquois scale1783

topograph1865

outkeeper1868

aba1876

1616 A. Rathborne Surveyor 121 Whereunto I haue added an absolute Instrument, which I call the Peractor.

1674 W. Leybourn Compl. Surveyor (ed. 3) 237 An Instrument which he [sc. Aaron Rathborne] calleth a Peractor, which is no other than a Theodelite, only the Box and Needle is so fitted to the Center of the Instrument, that..the Index may be turned about, and yet the Box and Needle remain immoveable.

1766 Compl. Farmer at Surveying For the doing of this, there are several instruments very proper, especially Mr. Rathburn's quadrant upon the head of his peracter.

1933 Geogr. Jrnl. 82 533 Aaron Rathborne, with his Peractor.., was eclipsed in activity by William Leybourn.

2000 G. Turner Elizabethan Instrument Makers ii. 248 The peractor employs the principle of similar triangles to link the incline with the horizontal distance and height.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	peractor
释义	peractorn. Brit. /pəˈraktə/, U.S. /pəˈræktər/ Forms: 1600s 1800s– peractor, 1700s peracter. Origin: A borrowing from Latin, combined with an English element. Etymons: Latin peract- , peragere , -or suffix. Etymology: < classical Latin peract-, past participial stem of peragere peract v. + -or suffix. Compare post-classical Latin peractor a person who accomplishes (first half of the 16th cent.).With the form peracter compare -er suffix¹. Surveying. Now historical. A kind of theodolite (see quot. 1674). ΘΚΠ the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > other surveying instruments quadrat?c1400 trigon1590 square1600 peractor1616 definitor1664 Marquois scale1783 topograph1865 outkeeper1868 aba1876 1616 A. Rathborne Surveyor 121 Whereunto I haue added an absolute Instrument, which I call the Peractor. 1674 W. Leybourn Compl. Surveyor (ed. 3) 237 An Instrument which he [sc. Aaron Rathborne] calleth a Peractor, which is no other than a Theodelite, only the Box and Needle is so fitted to the Center of the Instrument, that..the Index may be turned about, and yet the Box and Needle remain immoveable. 1766 Compl. Farmer at Surveying For the doing of this, there are several instruments very proper, especially Mr. Rathburn's quadrant upon the head of his peracter. 1933 Geogr. Jrnl. 82 533 Aaron Rathborne, with his Peractor.., was eclipsed in activity by William Leybourn. 2000 G. Turner Elizabethan Instrument Makers ii. 248 The peractor employs the principle of similar triangles to link the incline with the horizontal distance and height. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.1616
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