Accession No

3034

Brief Description

‘Benison’ wind calculator, by J. H. Steward Ltd., English, 1/2 20th Century

Origin

England; London; Strand

Maker

J. H. Steward Ltd.

Class

calculating; military

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

plastic (celluloid); metal

Dimensions

length 154mm; width 153mm

Special Collection

Steward collection

Provenance

Collection purchased from member of the Steward family, 1974.

Inscription

‘J.H. STEWARD LTD. LONDON’ (top right of obverse)
‘THE “BENISON” WIND CALCULATOR.
Wind Corrector for 10 f.s. Head or Following and Lateral Wind.’ (back)

Description Notes

White celluloid square carrying degree scale divided 0 - [360], numbered by 10˚, subdivided to 5˚; also marked with 8 points of the compass. Over this rotates a white celluloid disc marked with degree scale divided [0] - 90˚ - 0 - 90˚ - [0], numbered by 10˚, subdivided to 5˚; also two further scales for wind speed, one for head or following wind, and one for lateral wind. Centre gives conversion chart between miles per hour and feet per second. The scales on the disc are also printed on the base underneath the disc.
Reverse carries instruction for use of instrument.

Condition fair (very warped, discoloured); complete.

References

Events