A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Gary LaPook
Date: 2019 Jul 12, 21:55 -0700
As long as the axis of your level is verticle then it doesn't matter about the axis or the telescope itself. This is how we do do it in the field artillery. The quadrant that is used to measure the elevation is mounted so that it rotates around an axis alligned with the bore of the gun. Then you "cross-level" it and then the quadrant is verticle and provides an accurate measure of the elevation.