Accession No

2559

Brief Description

abney level, by L. Casella, English, 1890 (c)

Origin

England; London

Maker

L. Casella

Class

surveying

Earliest Date

1890

Latest Date

1890

Inscription Date

Material

metal (alloy, brass); glass

Dimensions

length 120mm; height 52mm; breadth 30mm part length 20mm; breadth 8mm

Special Collection

Provenance

Inscription

‘L Casella
LONDON’

Description Notes

Square metal alloy sighting tube. Diagonal mirror across upper half views bubble through window. Vertical semi-circle graduated 60-0-60˚ and read by vernier arm and magnifying glass. Scale of gradient 1-1-10. Bubble and vernier arm mounted on mutual axis controlled by milled spoked wheel.
Broken piece in separate bag.

Condition: good.

References

Events