The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 107
tuation with respect to the telescope may be adjusted. The telescope, GH, attached to the other end of the horizon-index, is an astronomical one, inverting the observedubjects, and has two parallel wires in the common focus of the glasses, distant from each other between 2 and 3degrees. These…
Navigation · Nautical astronomy
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