NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: How Many Chronometers?
From: Brad Morris
Date: 2009 May 6, 16:57 -0400
From: Brad Morris
Date: 2009 May 6, 16:57 -0400
Hi Jim True, it is a clock with a known rate, but the rate can change! Let us assume for a moment a mechanical chronometer. As the lubrication ages, the rate changes. In the literature, you can see instances of a sea rate and a land rate. Temperature can also affect the rate. For an electronic (quartz) chronometer, a very run down battery will have a slowing rate. For any of these items, how would you know the rate was changing? Greg suggested comparison to other chronometers. Henry and I have suggested celestial observations with a known longitude. We can even see Worsley and Shackleton, attempting to correct their chronometers by lunar occultations, when stuck on the ice in the Weddell Sea. Best Regards Brad -----Original Message----- From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of James N Wilson Sent: Wednesday, May 06, 2009 4:39 PM To: NavList@fer3.com Subject: [NavList 8163] Re: How Many Chronometers? Brad: I guess I thought that a chronometer was defined as a clock with a constant rate of change. Jim Wilson ____________________________________________________________ New to Digital Photography? Click Here. "Confidentiality and Privilege Notice The information transmitted by this electronic mail (and any attachments) is being sent by or on behalf of Tactronics; it is intended for the exclusive use of the addressee named above and may constitute information that is privileged or confidential or otherwise legally exempt from disclosure. If you are not the addressee or an employee or agent responsible for delivering this message to same, you are not authorized to retain, read, copy or disseminate this electronic mail (or any attachments) or any part thereof. If you have received this electronic mail (and any attachments) in error, please call us immediately and send written confirmation that same has been deleted from your system. Thank you." --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
