A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Randall Morrow
Date: 2017 Jan 30, 06:38 -0800
If you look closely at the photo you see the flag blown out straight and the navigators coat blown back against his body. It seems likely that this wind would have even disturbed mercury. This is the same photo I saw. If you blow up the photo it looks more like a vintage mirror unit, with a square shape. Vintage mercury units tend to be rectangular in the pictures I have seen.