Accession No

3042

Brief Description

Oke's plotter and deflection scale, by J. H. Steward and J. H. Steward Ltd., English, 1900–1916

Origin

England; London

Maker

J. H. Steward J. H. Steward Ltd.

Class

military

Earliest Date

1900

Latest Date

1916

Inscription Date

7/1916

Material

plastic (two types of celluloid); hide (leather); metal (leather)

Dimensions

3042 A length 21mm; breadth 166mm; thickness 12mm 3042 B length 130mm; breadth 40mm case length 251mm; breadth 185mm

Special Collection

Steward collection

Provenance

Collection purchased from member of the Steward family, 1974.

Inscription

‘Oke’s Plotter’ (obverse of 3042 A)
‘J.H. STEWARD LONDON’ (obverse of 3042 A)
‘J.H. STEWARD LTD. LONDON’ (reverse of 3042 B)
‘The “Oke” Deflection SCALE’ (obverse of 3042 A)
‘A.L. OKE, CAPT. R.G.A.
14TH Siege Battery, R.G.A.
B.E.F.
France
July 1916’ (case)

Description Notes

Leather case with brass buckle containing
3042 A: Oke’s plotter. Rectangular white celluloid base over which rotates a transparent celluloid disc and index. Base has degree scale divided [0] - [180] - [0], numbered by 10˚, subdivided to 5˚; also series of horizontal lines with central one marked ‘line of sight left observer’; vertical scale at diameter of disc, divided [300] - [0] - [300], numbered by 100, subdivided to 10. Disc has diametrical scale divided 300 - [0] - 300, numbered by 50, subdivided to 10, and arrow marking ‘line of sight right observer’. Index marked ‘line of fire’, with scale divided -300 - [0] - [400], numbered by 100, subdivided to 10.
and 3042 B: Oke’s deflection scale. White celluloid (?) rectangle. Obverse has table of deflection angles for different ranges. Scales continued on reverse.

Condition good (3042 A is much discoloured, case buckle very corroded); complete

References

Events