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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: On lunars generally
From: Geoffrey Kolbe
Date: 2009 Jul 08, 06:51 +0100
From: Geoffrey Kolbe
Date: 2009 Jul 08, 06:51 +0100
Frank wrote (NavList 9014) >The ratio of chronometer price to sextant price >has fallen from 10-to-1 to 2-to-1. And I >couldn't guess about actual sale prices for >"second-hand" instruments. What would be the >price for a five-year-old high-quality sextant? >And the price for a five-year-old chronometer? > >I have no information at hand on US prices in the same period. Yes, a ratio of two to one on chronometer to good sextant price is my reckoning, too - and that ratio persists today. You can pick up a reasonable 20th century mechanical chronometer (even some new ones still from Russia) for around �2000 and a good sextant is about half that. The fact that London was the centre of the world's chronometer industry in 1850 may have influenced the price in the United States - vs - England. The United States had a large merchant fleet, but a very small chronometer industry. Those chronometers that were built in the US would probably have been mostly built using parts shipped over from England rather than made from scratch. On the matter of second hand instruments. I think that in general, chronometers would have belonged to the company that owned the ship, whereas the sextant would have been the personal property of the ship's officers - a tradition that persisted right up to the present day. Chronometers tended to stay with the ship. Chronometers were not like cars today, where after five years the thing is out of fashion, clapped out, and you trade it in for a new one. There were chronometers in the British navy that stayed in use for over a hundred years! I suspect that chronometers would have been rare on the second hand market - as they are today. Look at the number of marine chronometers for sale on ebay compared to the number of sextants. I think a five year old chronometer for sale in Boston, say, in 1850, would have been much the same price as a brand new one. And Frank said "I think by my logic above I was suggesting that one EXTRA chronometer was more economical than one (good) sextant --not half the price. :-)" I figured that there was some subtle logic like that behind your statement Frank - but I am a bear of little brain and it is too subtle for me, I am afraid. ;-) I think the idea of using one chronometer, checked periodically using lunars, would be much more economical that an extra chronometer. If the two chronometers disagreed, you are back to using lunars to check which is in error. To get away from a heavy dependence on lunars as a check on the chronometer(s) you need three chronometers at least. Geoffrey --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---