Adler AIS | Details

Object number

M-138
Classification

Surveying
Object name

Level
Creator

Unidentified
Description

Isosceles triangle with plumb bob pivoted from vertex. Bob has pierced circle and double-cone tip. Inverted heart-shaped target and a circular aperture pierced in plate. Rococo engraving. Verso plain.
Inscription/Sig.

Unsigned.
Material

brass

Dimensions

Frame