Accession No

3715

Brief Description

nautical hemisphere, by Etienne Lenoir, French, 1800 (c)

Origin

France; Paris

Maker

Lenoir, Etienne

Class

navigation

Earliest Date

1800

Latest Date

1800

Inscription Date

Material

metal (brass)

Dimensions

diameter 165mm; thickness 24mm

Special Collection

Provenance

Purchased, 1988.

Inscription

‘Lenoir a Paris’ (top of cross bar)

Description Notes

Nautical hemisphere, Etienne Lenoir, French, c. 1800.

Calculating instrument made in brass. The circular plate has a fixed scale of “Hauteur de la Lune” on a raised semicircular limb, and hinged at the ends of this semicircle is another one with “Hauteur du Soleil”. Moving within the latter is a second hinged semicircle with a scale of “Distances”, carried on a diametric bar with a friction-tight pointer registering on a repeating 10-0-10 degree scale covering the semicircular remainder of the base plate. The 2 hinged semicircles are bevelled so that their intersection can be measured precisely.

Condition: good; complete.

References

Events