Accession No

3032

Brief Description

Hunter’s circular range rule, by J. H. Steward Ltd., English, 1/2 20th Century

Origin

England; London

Maker

J. H. Steward Ltd.

Class

mathematics

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

plastic (ivorine and one other); metal (brass); hide (leather); thread

Dimensions

length 115mm; breadth 116mm; thickness 7mm case length 125mm; breadth 139mm; thickness 20mm

Special Collection

Steward collection

Provenance

Collection purchased from member of the Steward family, 1974.

Inscription

‘HUNTER’S
Circular Range Rule
RD. NO. 662018’ (reverse)
‘J.H. STEWARD LTD. LONDON’ (reverse)

Description Notes

Square ivorine plate with central circular rotatable section.
Obverse: scale of inches along one edge, divided 0 - 4, numbered by 1, subdivided to 1/16. Opposite edge has scale of centimetres, divided 0 - 10, numbered by 1, subdivided to 0.1. Third edge has scale of ‘degrees at 23 ins. radius’, divided 0 - 10, numbered by 1. Last edge has map scale for 1:20000, divided 0 - 2000 yards, numbered by 500, subdivided to 50. Circular log scale around central disc divided 100 - 20000, numbered 100, 200...1000, 2000...15000, 20000. Central disc has two log scales, one in red and one in black; black scale divided [5] - 5000, numbered 10, 15, 20, 30...100, 200...1000, 2000...5000; red scale for ‘metres’, divided 1 - 100, numbered 1, 2, 3, 4, 5, 10, 15, 20, 30...100. Three brass studs for moving inner disc.
Reverse: circular log scale around central disc divided 4´ - 90˚ and back to 175˚ (at 5˚), numbered 4´, 5´...10´, 15´...30´, 40´, 50´, 1˚, 1˚ 30´, 2˚, 3˚...10˚, 12˚...20˚, 30˚...70˚, 90˚, 110˚, 120˚...140˚, 145˚...175˚. Central disc has log scale divided 1´- 90˚ and numbered 1´, 2´, 3´ and then as previous scale (but no markings above 90˚).
Leather pouch case with press stud fastener in brass and plastic.

Condition good (case fair); complete.

References

Events