Accession No

1855

Brief Description

miner's dial or surveying compass, by J. Gargory, English, 1800 (c)

Origin

England; Birmingham; 5 Bull Street

Maker

Gargory, J.

Class

surveying

Earliest Date

1800

Latest Date

1800

Inscription Date

Material

metal (brass, silver, steel); wood (mahogany)

Dimensions

box length 274mm; breadth 164mm; height 81mm

Special Collection

Heywood collection

Provenance

Purchased from the Professor Harold Heywood collection under estate duty exemption benefit with the assistance of a Science Museum grant-in-aid.

Inscription

Mining dial
‘J. Gargory Fecit
5 Bull St. Birmm.’ (on compass rose)

Description Notes

Brass. Silvered 8 point rose. Steel needle. Graduated 0-90-0 twice by 10 and 0-360˚ to 1˚. Vernier scale reads to 3’ clamp and motion screw for vernier plate and sights below compass box. Locking bar for needle. Socket and clamp for attachment to tripod. Slit and window/pinhole sights; hinge forward when not in use.
Bubble below compass box and on limb of sights. Brass lid for compass box with scales of elevation and depression graduated 50-0-50 and 40-0-40 to 1 ‘links’.
Fitted mahogany box.

References

Events