NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bill Noyce
Date: 2010 Mar 24, 08:21 -0700
I don't think the optical paths need to be parallel for the fore-sight and the back-sight. The only requirement for the scale to read right is for the back-horizon mirror to be at an angle of 90 degrees from the fore-horizon mirror. It can then be placed almost anywhere, as long as the back peephole then allows the index mirror to be seen in the back-horizon mirror. Remember that the genius of the octant (and sextant) is that it measures the angular difference between the horizon mirror and the index mirror, regardless of how the instrument is oriented.
-- Bill N.
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