Accession No

2823


Brief Description

Gunter rule by Robert Yeff, 1712


Origin

Bristol; England


Maker

Yeff. Robert


Class

calculating


Earliest Date

Jan. 1, 1712


Latest Date

Dec. 31, 1712


Inscription Date


Material

wood (boxwood)


Dimensions

length 605mm; breadth 50mm; thickness 10mm


Special Collection


Provenance

Purchased from Peter Delehar, London, England, 1982.


Inscription

‘Robt Yeff fecit 1712’


Description Notes

Boxwood rule engraved with scale of inches, inch scale divided diagonally, scales of ‘Lea’, ‘Lon’ (longitude), ‘Poi’, ‘Cho’ (chords), ‘Num’ (logs of numbers), artificial sines and tangents, meridional parts, etc.

Condition


References


Events

Description
Scale Rule
A straight rule with a scale engraved along the length is the simplest instrument for making linear measurements, and has been used since antiquity. However, scale rules were not commonly used for making scale drawings until around 1550 in Northern Europe. Anthropomorphic dimensions such as the foot were commonly used for the scale.

Scale rules can be straight or folding and often have even scales on one side and diagonal scales on the other, which enable the user to divide any measurement into 100 parts. They were often decorated by the maker, demonstrating artistic as well as mathematical skills (although they became more purely functional from mid-18th century). They were usually made of brass, silver, ivory or boxwood.



FM:42502

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