Trough Compass with Case, 1916
Detailed Description
The storage case has a sliding lid. The compass is marked Troughton & Simms Ltd, London, 1916, No.9214. A trough compass is used with either a plane table or a theodolite. The needle is a long magnetized bar of steel which is pointed at both ends.
Object ID: USGS-000824
Sources/Usage
Public Domain.