A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Sean C
Date: 2017 Oct 29, 14:23 -0700
It appears to be a surveying sextant. I believe they were only used to measure the arc distance between features on the ground, therefore no shades were needed. In one of the pictures, you can see the broken off index mark for the micrometer. At least it's included. Perhaps it could be reattached.