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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Worsley's Chronometer(s)?
From: Brad Morris
Date: 2009 Feb 24, 14:21 -0800
From: Brad Morris
Date: 2009 Feb 24, 14:21 -0800
Gentlemen I went back and present herein the two chronometers which claim to be the one used by Worsley. Obviously, they both can't be right. This one is from the National Maritime Museum in Greenwich, England and is a Thomas Mercer boxed, gimbaled chronometer. http://www.nmm.ac.uk/server/show/conMediaFile.2279 This one is from the James Caird Society, a pocket watch type chronometer http://www.jamescairdsociety.com/shackleton-news.php?id=102901 The James Caird Society article also contains an image of Worsley using the sextant without an artificial horizon to check his location, while trapped in the ice. The US Navy published a book in the early 1950's called "Naval Arctic Operations Handbook" in which they indicate that this practice is feasible if you estimate the height of the ice around you and use that as your 'sea level'. Then the height of your eye above the height of the ice around you will yield the correction for dip. Best Regards Brad --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
