Here is what I found when I googled it

Patented by E.S.Ritchie, the earliest types of liquid filled compasses were
filled with an alcohol and water mixture to dampen the motion of the
compass card. Alcohol was used in order to keep the liquid from
freezing.The hand painted dials had to be painted with a special egg based
paint that was also patented by E.S.Ritchie. To compensate for expansion
and contraction of the fluid due to temperature changes, he also patented
an expansion chamber that is housed in the base of the compass


On Wed, Nov 20, 2013 at 2:31 AM, Rich Knowles <r...@sailpower.ca> wrote:

> Likely something to do with the needle.
>
> Rich
>
>
> > On Nov 20, 2013, at 1:07, Jim Watts <paradigmat...@gmail.com> wrote:
> >
> > Compasses are filled with alcohol for the same reason that people are
> filled with alcohol. Whatever reason that may be.
>
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