American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 204
Fig. G4. MARINE SURVEYING. 197 … Fig. 65. the dot, lay off the two observed angles right and left of the line; then, laying thison the plan, move it about till the throe lines pass exactly through the three stationsobserved. The dot from which they were laid off will be on the position of the observer,and must be pricked lightly…
Navigation · Nautical astronomy
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