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 203
ocated by its use. 429. As this instrument is not made -with both right and loft arms capableofbeing set to small angles down to 0°, the manufacturers make protractors witheither small right or small left angles. Surveying parti(-s should be equipped withboth. In default of a three-armed… … Fig. G4. MARINE SURVEYING. 197
Navigation · Nautical astronomy
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