NavList:

On 6/1/06 10:43 AM, "jean-philippe planas" <jeanphilippeplanas@yahoo.com> wrote:

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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Guys,

I’m no expert on these things.  I can’t think of any downside to all these suggestions except that the combining glass and sun shades might fall out of their mounts.  But, they are probably ready to do that anyway due to age.

Ken
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