NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Astra IIIB
From: Doug Sterrett
Date: 2001 Apr 24, 10:35 AM
From: Doug Sterrett
Date: 2001 Apr 24, 10:35 AM
John, please caution people that mercury is highly poisonous and very dangerous for laymen to handle. In many states it is a controlled substance. It is also extremely expensive. Humbly submitted by Doug At 12:34 AM 4/25/01 +1000, you wrote: >a shallow pan of mercury is perfect>cheers, >John > >At 21:34 23/04/2001 -0700, Yves Arrouye wrote: >> > The practice bubble horizon is difficult to use. There is no >> > magnification. >> > The slit aperture makes me see double of the reference line >> > in the sight. >> > Combine that with trying to hold the sextant steady so the bubble is >> > centered while adjusting the sight ... it can be frustrating. >> >>I know, I tried it. What's very frustrating is how any small movement makes >>the bubble go away. But then, I didn't seem to have much success with a pan >>of water in my garden either. Maybe oil would be better? Anyway, the bubble >>horizon is on order, and I'll see what my first sights will be. Not good I >>imagine... >> >>YA
