Accession No

0928

Brief Description

Plane table alidade with altitude quadrant and sights, by Fahlmer, early 19th C

Origin

Strasbourg; France

Maker

Fahlmer

Class

surveying

Earliest Date

1800

Latest Date

1830

Inscription Date

Material

metal (brass)

Dimensions

alidade length 440mm; telescope length 375; minimum height 179mm

Special Collection

Robert Whipple collection

Provenance

It appears that this object was purchased by Robert Stewart Whipple from E.R. Watts & Son. E.R. Watts & Son Ltd, p.8 say ‘used for setting gun positions at the famous French Fort of la Rochelle’.

Inscription

‘Fahlmer à Strasbourg
Dépot de la Dir.on
de la Rochelle’ (alidade)

Description Notes

Brass tube sight with pinhole/window sights mounted over tube. Axis pivots on vertical support with altitude arc graduated 50 - 0- 50, numbered by 10, graduated to 30´. Read by a pointer on vertical support. Plumb bob in window pierced through support, which is screwed to base. Base has engraved scale 100 - [0] - 1200, numbered by 100. Divided horizontally 1 - 10 with transversal scale across 100 - 0.

Condition good; complete

References

Events