Accession No

5941

Brief Description

adapted Brunton compass clinometer; first half 20th-century

Origin

Maker

Brunton

Class

earth sciences; surveying

Earliest Date

1930

Latest Date

1950

Inscription Date

Material

metal (steel, brass, aluminium); glass (mirror)

Dimensions

length 154 mm; width 73 mm; depth 134 mm

Special Collection

Brian Harland collection

Provenance

Donated on or before 23/06/2003.

Inscription

Description Notes

Compass clinometer adapted by Brian Harland for use in the survey of Svalbard.

The unit has a hinged lid which has a small round glass viewing window set into it close to the hinge. Opposite the hinge on the top of the lid is a fold down pin sight which when the lid is opened folds round to align with another sight set on an arm. Set into the inside of the lid is a round mirror marked with a line which extends from the sight toward the compass. The compass and clinometer are glazed into the main section of the instrument. The clinometer is attached behind the the compass needle and consists of two ligquid filled bubble levels mounted on a graduated pointer with an arc measuring 60˚ - 0 - 60˚. The clinometer is moved using a swivel handle at the back of the instrument and the graduated pointer moves along a degree arc etched onto the back plate which runs from 90˚ - 0 - 90˚. Set above the clinometer is a compass needle. Around the periphery of the instrument is a scale dilineated into 10˚ sections running from 0 - 360˚. A hinged fold down sight on an arm is attached to the compass.

The instrument has been adapted by Brian Harland for his use of the survey of Svalbard by fixing the instrument to a rectangular aluminium base plate. The instrument is attached with two screws to one end of the plate and a hole has been cut in the back to facilitate access to the swivel handle of the clinometer. The plate has two further holes drilled into it.

Condition good; complete

References

Events