NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Children's land-locked "Sextant"
From: Ken Muldrew
Date: 2007 Nov 29, 09:42 -0700
From: Ken Muldrew
Date: 2007 Nov 29, 09:42 -0700
On 29 Nov 2007 at 8:25, Fred Hebard wrote: > I'm not sure the risk is minimal. Other solutions work fairly well, such > as using a machinist's level on a flat mirror or cooking oil over Karo > corn syrup. An alloy of 76% gallium and 24% indium will provide a useable metal liquid that isn't mercury (the melting point is 16�C but it can easily supercool to about -20�C). Maybe there is a combination of high density liquid and low density glass that could produce a floating mirror? I remember someone on the list once describing a sealed mercury artificial horizon made from glass stuck together with silicone. I think the mercury still became tarnished after a time, but I can't recall the details. Anyone? Ken Muldrew. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---