Expedition Alidade with Case
![Image: Expedition Alidade with Case](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/000328-Expedition_Alidade.jpg?itok=4gcC5_Pg)
Detailed Description
The rectangular base (blade) features two different types of spirit levels and a trough compass. Manufactured by W. & L.E. Gurley, Troy, New York.
Object ID: USGS-000328
Sources/Usage
Public Domain.