Accession No

3085

Brief Description

range computer, by J. H. Steward, English, 1/2 20th Century

Origin

England; London

Maker

J. H. Steward

Class

calculating; military

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

plastic (celluloid)

Dimensions

length 323mm; width 77mm

Special Collection

Steward collection

Provenance

Collection purchased from member of the Steward family, 1974.

Inscription

‘J.H. STEWARD. LONDON’ (top right)

Description Notes

Transparent celluloid rectangle with scale along left hand edge marked ‘diff. in level. feet’, divided [0] - 1000, numbered by 100, subdivided to 50. Scale along bottom edge marked ‘yards 1in to a mile’, divided 1000 - [0] - 21000, numbered by 1000, subdivided to 500, first 1000 subdivided to 100. Various plots on grid for angle of sight, drawn using these scales; marked for angles from 15´ to 10˚.

Condition good (very warped); complete.

References

Events