Accession No

3026

Brief Description

two 'Oke' universal windage calculators, by J. H. Steward Ltd., English, 1/2 20th Century

Origin

England; London

Maker

J. H. Steward Ltd.

Class

calculating; military

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

plastic (ivorine); metal (brass); cloth; rope (string)

Dimensions

both length 104mm; breadth 103mm case of both length 119mm; breadth 117mm

Special Collection

Steward collection

Provenance

Collection purchased from member of the Steward family, 1974.

Inscription

‘The “Oke” Universal Windage Calculator.’ (obverse of both)
‘J.H. STEWARD LTD. LONDON’ (reverse)

Description Notes

Two identical square ivorine windage calculators as designed by Oke.
Obverse: 16-point wind rose, marked by initial, with degree scale divided [0] - 360˚, numbered by 10˚, subdivided to 5˚. Rotatable disc within this, marked with deflection scale, divided [0] - 90 - [0] - 90 - [0], numbered by 30˚, subdivided to 10˚.
Reverse: quadrantal plot of deflection against range. Degree scale divided 0 - 45˚ - 0, numbered by 5˚. Concentric quadrants marked at even distance and divided [0] - 80, numbered by 10, subdivided to 5. 3026.1 has manuscript notes on reverse.
Cloth slip cases with plasticised covering.

Condition good; complete.

References

Events