Re: What is the composition of the liquid used to fill a Silva compass?

This question is outside of my area of expertise.
However, there are only several fluids used in  compasses, gages, etc.
that I know of.	Of more importance is the viscosity of the mixture, usually
mixed with a solvent (water or alcohol)

	Fluids commonly used are:
	Water - probably not in this case, could freeze
	Alcohol - possibly
        Glycerol - possibly, if thinned out
	Ethylene Glycol - green tint, possible if thinned out.

A couple of web sites I found; although not containing the answer are:
http://ourworld.compuserve.com/homepages/silvauk/homepage.htm
http://www.silva.se/files/history1.html