A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bill Morris
Date: 2018 May 8, 15:17 -0700
Tony, there are at least two good reasons for not having a mercury horizon in an aircraft:
1) Vibrations would disturb the reflective surface and the mercury would be subject to the same accelerations as a bubble level;
2) If spilled, the mercury would corrode metal components of the aircraft, quite speedily in the case of aluminium.