NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
RAF MK9 Bubble Sextant
From: Steven Grobler
Date: 2003 Jan 18, 17:57 +0800
From: Steven Grobler
Date: 2003 Jan 18, 17:57 +0800
Good day all, I've recently acquired an old MK9B RAF sextant and I am hoping that someone could shed some light on a few issues (I've read some of the previous posts and I have a copy of the MK9A manual, courtesy of Clive Sutherland's earlier posting). I am not intending to use the sextant seriously, its more of a hobby item at this stage. 1. I am unable to produce a bubble because the bubble chamber is only partially full of fluid. Could anyone explain the principle of operation of the bubble device itself? What fluid is used? Could I refill it? If so what would be the procedure? 2. my sextant (the B variation) has an additional control on the clockwork averaging mechanisim, near the winder - a small two position selector marked I and II. I guess this might change the averaging time, or number of averages... Could anyone confirm? -- Steve G
