Accession No

6809

Brief Description

nautical quadrant, calculator for plane sailing, by John Williamson, English, 1800 (c)

Origin

England; Whitehaven

Maker

Williamson, John

Class

navigation

Earliest Date

1800

Latest Date

1800

Inscription Date

Material

metal (brass)

Dimensions

[quadrant] 310mm(wide) 325mm(depth) 105mm(height) [T-square] 180mm(wide) 355mm(depth) 2mm(height)

Special Collection

Provenance

Purchased from Tesseract 22/01/24

Inscription

John Williamson Whitehaven Fecit

Description Notes

Nautical quadrant, calculator for plane sailing, by John Williamson, English, 1800 (c)

Brass segment shape (X and Y axis and 90° arc) with a movable indicator arm that pivots from the corner

With a T shaped brass bar that has a scale labelled 'perpendicular Departure Crusor'

References

Events