Accession No

0441

Brief Description

Verie pattern gauging slide rule, by E. Roberts, 1/4 18th C

Origin

Dove Court; Old Jewry; London; England

Maker

Roberts. Edward

Class

calculating

Earliest Date

1700

Latest Date

1725

Inscription Date

Material

boxwood; metal (brass)

Dimensions

length 305mm; breadth 29mm; thickness 24mm

Special Collection

Robert Whipple collection

Provenance

Purchased from T.H. Court in 05/1927. The price was not noted in the accession register.

Inscription

‘EDWD. ROBERTS Maker Dove court old Jewry LONDON’ (under slide on face A)

Description Notes

Boxwood slide rule with inlet brass gauging points.
Face A: upper part of stock has single radius log scale marked ‘A’, divided 1 - 10, numbered by 1; gauge points marked ‘MB’ and ‘A’. Slide has single radius log scale marked ‘B’ divided 1 - 10, numbered by 1; gauge point marked ‘W’. Lower part of stock has inverted single radius scale marked ‘MD’ divided [2.15] - [21.5], numbered 3, 4...10, 2[0]. Reverse of slide has list of gauge points.
Face B: single radius log scale begins on upper part of stock and continues on lower; marked ‘D’, divided 1 - 10, numbered 1, 2, 3, 3[.]1, 3[.]2, 4, 5...10; gauging points marked ‘WG’, ‘AG’, ‘MS’ and ‘MR’. Slide has single radius log scale marked ‘C’, divided 1 - 10, numbered by 1. Reverse of slide carries conversion factors.
Edge A: double radius log scale beginning on upper stock and continuing on lower, marked ‘Seg. St.’ and ‘SS’, divided [0.8] - 100, numbered 1, 2...10, 20...100. Slide has single radius log scale marked ‘B’, divided 1 - [9.5], numbered by 1. Reverse carries tables of conversion factors.
Edge B: double radius log scale beginning on upper stock and continuing on lower, marked ‘Seg. Ly’ and ‘SL’, divided [0.3] - 100, numbered 1, 2...10, 20...100. Slide has single radius log scale marked ‘C’, divided 1 - [9.5], numbered by 1. Reverse of slide carries three scales: inch scale divided [0] - [12], numbered by 1, subdivided to 0.1; scale marked ‘Spheroid’, divided [0] - [7.5], numbered by 1, subdivided to 0.1; scale marked ‘2d Variety’, divided [0] - [6.5], numbered by 1, subdivided to 0.1.
Each slide is bound in brass at one end.

Condition good (some warping, all slides are very tight); complete.

References

Events