NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: How Many Chronometers?
From: Gary LaPook
Date: 2009 Sep 20, 12:11 -0700
From: Gary LaPook
Date: 2009 Sep 20, 12:11 -0700
I considered that too and I also suspect that such a small heater could be made today with solid state controller that would use just a small amount of electricity but I wanted to keep it simple, using things normally available. gl Philip wrote: > Since it has already been discovered by the list that it is easier to > maintain temperatures above ambient, eg. crystal heaters in HF radios, > than below, i would suggest a small well insulated box with a > thermostatically controlled heater (one or two watts, 12-15v DC?). The > Watch could be viewed through a double or triple insulated glass window > so as to not disturb the thermal equilibrium. This would be a nice > project not beyond the capabilities of many of us. A couple of LED's to > indicate operating temperature and power on and it would be a nice piece > of kit to have at the nav station. > Philip > > > > , 2009-09-20 at 01:40 -0700, Gary LaPook wrote: > >> So, if the cabin can't be maintained at around 25ºC then an alternate >> way to stabilize the watches can be utilized. Simply buy a small >> cooler and put the watches and some ice in it and establish their >> rates at this cooler temperature, they should be running slow. >> --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---