NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: How does the AstraIIIb split mirror work?
From: Jim Thompson
Date: 2004 Apr 23, 10:04 -0300
From: Jim Thompson
Date: 2004 Apr 23, 10:04 -0300
> -----Original Message----- > From: Navigation Mailing List > [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]On Behalf Of Joel Jacobs > > Unless all your tests were made with a perfectly vertical instrument it is > hard to judge the cause of the variations. I have seriously been thinking about mounting the sextant on a camera tripod to hold it solidly in 3 dimensions, but the boat just arrived in the yard from storage and my priorities have just changed. > 4. I found Paul's suggestion noteworthy. However, I don't > understand how if > you block the clear portion of the horizon mirror from the mirror's front, > how you can have an object seen on a non-reflective surface. > > Did you block it from the front or the back? From the back, which would allow the index mirror's image to reflect off the clear-window glass on the horizon mirror. I think this proves that the clear window has reflective properties? Good point -- I will repeat the experiment by blocking from the front. Jim
