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August 10, 2021 at 3:20 pm #10470
Sorry, I don’t understand your comments. We’re talking about the bubble-octant of the 1930s ’40s… are you saying this is NOT an artificial horizon device???? I certainly thought it was! Also, your discussion about the effects of gravity seem to apply to a magnetic compass and not any form of a sextant–unless I am very mistaken.