My +30 year old Danforth is filled with mineral oil, at least that's
what the gentleman said he filled it with when I had it repaired a few
years back. He said it is filled under pressure and he actually kept it
for 24 hours to monitor for any leakage.
Maybe the reason he advised to take it off the boat in the winter is
that mineral oil freezing temp is -30C....I can't remember when we had
it that cold here in Halifax.
Nevertheless, my old Danforth will probably spend another cold winter on
the boat.
Bob Abbott
AZURA
C&C 32 - 84
Halifax, N.S.
On 2013/11/20 10:36 PM, Rich Knowles wrote:
Don got me thinking and is absolutely correct. I misread the Ritchie
information and said the compasses contained alcohol. Wrong.
Apparently Ritchie compasses are now filled with Isopar L, a
"synthetic isoparaffinic hydrocarbon solvent" made by Exxon Mobil.
According to Ritchie's website, they switched to this in 2001. A bit
of research revealed that the Isopar family has a wide variety of uses
as solvents for paints etc.
The freezing point of this Isopar Lis stated to be -60C, still well
below any temperatures that most of us will encounter.
Man, that crow has a taste....
Rich Knowles
INDIGO LF38
Halifax, NS.
On Nov 20, 2013, at 5:03 PM, Don Newman <donrnew...@gmail.com
<mailto:donrnew...@gmail.com>> wrote:
More expensive compasses tend to use a mineral oil for greater dampening.
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