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Bubble Sextant
R 1,000
8 Photo(s)
3 years ago443 views
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Description
I am selling a bubble sextant navigation instrument . Used for aircraft navigation in World War II
A normal sextant is unsuitable for use in an aircraft because the horizon is not level with the observer as in a ship, so the bubble sextant was developed for aeronautical use in the 1920s. It was very important in WWII. The automatic averaging atachment was meant to ensure that unbiassed measurements were made while the bubble and observer wobbled randomly, so that the error would reduce as the square root of the number of observations. Sixty measurements were averaged as the observer tried to keep the bubble and a star in coincidence for a two minute period.
Id Subtitle 1157464216
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ankcck
Selling for 15+ years
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Kindly read the entire description and view all the pictures before making contact. Swipe from one picture to the next, tap on picture for full view and pinch-zoom for greater detail.Unit pictured is the exact one that you're getting. Nothing more, nothing less. If it's not in the pictures, it's not there.Take your time to check through the pictures. I've tried to represent the products as honestly and completely as possible. I do my best to be your eyes when taking the pictures.Just look at it. Where will you ever come across another one? This is for the collector who wants that totally unique piece where nothing but the very best will do along with assured exclusivity. Size: l=224mm; w-136mm; h=55mm.Item not perfect but very special and could be easily restored for very little in the right hands. Tapestry has come loose and there's a crack in the cover, which was probably caused by the same event and will probably be repaired in the same stroke. Dimensions: w=220mm; l=135mm; h=55mm.Don't buy if you don't know what it is or can do! I can't offer you any backup; you buy as-is. No refunds, no returns.Why not make me an offer on it? You may well be better off for it? Collection from Alberton ONLY! (Couriers welcome too, but only after your funds have cleared).We chat on this platform only, so don't ask for WhatsApp/Wharrawharra. It'll prevent me from confusing you with somebody else and is also the recommended thing to do, for both your safety and mine. I've got the App on my cell phone, so will not be too far away to reply to you.
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