Accession No

0658

Brief Description

graphometer, c.1730

Origin

Maker

Class

surveying

Earliest Date

1730

Latest Date

1730

Inscription Date

Material

metal (brass); wood; hide (leather)

Dimensions

box length 350mm; breadth 245mm; height 96mm

Special Collection

Robert Whipple collection

Provenance

Purchased by Robert Stewart Whipple from T.H. Court on 05/11/1930.

Inscription

Description Notes

Brass. Pierced semi-circle graduated 0 - 180º clockwise and anti-clockwise and to 30’ of arc. Bevelled edge of the rotating alidade. Slit and window sights at 0/180º. Alidade with slit and window sights rotating with centrally mounted compass. Silvered 8 point rose. Lower scale 0 - 90 - 0º twice. Upper 0 - 360º. Circle is extended beyond 180º at both sides to support compass. Shaft below instrument for attachment to tripod. Attached to base of circle by 4 screws with decorated heads. Key with decorative head for deatching compass from semi-circle.
Wooden box covered with tooled leather.

References

Events