NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: A-12 Bubble sextant
From: Jean-Philippe Planas
Date: 2006 Jun 1, 10:52 -0500
Red <hellosailor@verizon.net> wrote:
From: Jean-Philippe Planas
Date: 2006 Jun 1, 10:52 -0500
I was also considering applying thermal deformation to the instrument but by heating that part of the sextant. However I was fearing the heat flux could permanently damage parts (the nearby mirror for instance). I had not thought of cold!
I'll be interested in Ken's reaction on these suggestions.
Red <hellosailor@verizon.net> wrote:
Ken, do you think that deep freezing the sextant would harm it?Placing metal objects in a deep freeze (at the local ice cream shop, etc.) and letting them cold soak for a full day often contracts metal parts enough so that they will unstick. Thermal cycling it, repeating the freeze/thaw two or three times, also breaks corrosion. (Home referigerator freezers usually don't get that cold.)I've done this with deep freeze, and also with a dry ice and alcohol mix (applied locally) and stuck things get unstuck very nicely. The cold shouldn't hurt anything, it is nowhere near the shattering effect of liquid nitrogen.<G>
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