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History of Science Museum

Simple Theodolite, Surveyor's Cross and Sundial, 17th Century

Inventory Number 36730


Item type
Object
Provenance
Presented by J. A. Billmeir.
Primary inscriptions
"g.m" on the hour scale of the dial; cannot stand for (Latin) degrees and minutes there. Possibly the maker's initials?
Physical material
Brass
Dimensions
Diameter: 116mm Height: 170mm Width: 140mm Depth: 140mm Weight: 0.725kg
Inventory No
36730
Accession Number
1957-84/255

Description

Four fixed sights and two rotating sights on alidade; all are slit type. Folding pin gnomon sundial with central compass. Scale of polygons. Ball-and-socket joint on reverse for mounting on post or stand, and permitting vertical as well as horizontal sightings.