American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 99
ed with verniers whichcontain one more division than the length of scale covered, and in which, therefore,scale-readings and vernier-readings increase in the same direction—toward the left hand. To read any sextant, it is merelynecessary to observe the scale division nextF below, or to the right… … 1 scale. 242. OPTICAL PRINCIPLE.—When aray of .light is reflected from a plane surface,the angle of incidence is equal to the angle ^j) of reflection. From this it may be proved Flo 33 that when a ray of light undergoes two reflections in the same plane the angle between its first and its last…
Navigation · Nautical astronomy
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