Scheme for taking sights by bringing image of heavenly body to spar towed by ship.
An improved towing spar which can be used as a navigational instrument
U. S. Naval Inst. Proc
United States Naval Institute -- Proceedings ; 46 , n 205
1920
3 pages
2 Figs.
Article (Journal)
English
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Navigational systems and instrument aids
Engineering Index Backfile | 1950
|Engineering Index Backfile | 1950