Accession No

2269

Brief Description

gauging slide rule by Edward Roberts, 2/2 18th C

Origin

Dove Court; Old Jewry; London; England

Maker

Roberts. Edward

Class

mathematics

Earliest Date

1750

Latest Date

1800

Inscription Date

Material

wood (boxwood)

Dimensions

length closed 306mm; breadth 29mm; thickness 16mm

Special Collection

Provenance

Purchased from Harriet Wynter, London, England, 16/9/1976

Inscription

‘* EDWD. ROBERTS Maker Dove Court old Jewry LONDON*’ (on stock, under slider)

Description Notes

Boxwood 12-inch Leadbetter type gauging rule.
Face A: upper stock has single radius log scale marked ‘Root’ and ‘D’, divided 1 - 10, numbered by 1, with brass studs marking gauge points ‘WG’ (wine gallon), ‘AG’ (ale gallon), ‘MS’ and ‘MR’. Slide has double radius log scale marked ‘Square’ and ‘C’, divided 1 - 10[0], numbered 1, 2...1[0], 2[0],...10[0]; also scale marked ‘Root’ and ‘D’, divided as that on stock. Lower part of stock has triple radius log scale marked ‘Cube’, divided 1 - 1000, numbered 1, 2...10, 2[0], 3[0]...100, 2[00], 3[00]...1000. On reverse of slide inch scale divided [24] - 36, numbered by 1, subdivided to 0.1; also scale marked ‘G’ (gallons), divided [1.6] - 3.6, numbered by 0.1, subdivided to 0.02.
Face B: upper part of stock has double radius log scale marked ‘A’, divided 1 - 10[0], numbered 1, 2...1[0], 2[0]...10[0], with brass studs marking gauge points ‘MB’ (malt bushel), ‘A’, ‘MB’ and ‘A’. Slide has pair of double radius log scales marked ‘B’ and ‘N’ divided 1 - 10[0], numbered as ‘A’. Lower part of stock has inverted double radius log scale marked ‘MD’ and divided [2.15] - [215], numbered 3, 4...1[0], 2[0]...10[0], 2[00]. Reverse of slide has inch scale divided [12.5] - [24.5], numbered by 1, subdivided to 0.1; also scale marked ‘G’ (gallons), divided [0.44] - [1.63], numbered by 0.1, subdivided to 0.01.
Edge A: upper part of stock has double radius log scale for ullaging marked ‘SS’ (segment standing), divided [0.8] - 100, numbered 1, 2...10, 20...100. Slide (with brass stud for ease of movement) has double radius log scale marked ‘Num’, divided 1 - 10[0], numbered 1, 2...1[0], 2[0]...10[0]. Lower part of stock has double radius log scale marked ‘SL’ (segment lying), divided [0.2] - 100, numbered 1, 2...10, 20...100. Reverse of slide has scale of inches divided [0] - [12], numbered by 1 (up to 9), subdivided to 0.1; also scale for reduction of cone frustrum casks to cylinder, divided [0] - [6], numbered by 1, subdivided to 0.1 (both these scales in pencil).
Edge B: scale of inches divided [0] - 12, numbered by 1, subdivided to 0.1. Second scale marked ‘Spheroid’, divided [0] - [7.5], numbered by 1, subdivided to 0.1. Third scale marked ‘2d Variety’, divided [0] - 6, numbered by 1, subdivided to 0.1. Fourth scale marked ‘3d Variety’, divided [0] - [5.5], numbered by 1, subdivided to 0.1.

Condition fair (chip in one slide); complete.

References

Events