The new American practical navigator : being an epitome of navigation, containing all the tables necessary ... (1802)
Bowditch, Nathaniel, 1773-1838, Lee, Marvin, former owner. DSI, Stuart, Gilbert, 1755-1828 DSI, Burndy Library, donor. DSI · [Salem] : Printed at Newburyport, Mass., 1802, by Edmund M. Blunt, for Cushing and Appleton, Salem : Sold by every book-seller, ship- chandler, and mathematical-instrument-maker in the United States and West Indies · leaf 145
image of the objectis brought down to the viriblehorizon in thedirection DB ; therefore the angle of eleva-tion given by the quadrant is. too great bythe angle BDE, This angle is decreafed alittleby means of the terreftrial refraction, which makes the point B appearwithin thelimitof the vifible… … AND Dlf OF THE HORIZON. 133 When the limit B, of the horizon, is not vifible by reafon of the land atF, an obfervaticn cf the altitude of any object may be made, by bringingits reflected image to the furface of the water at F. Ihe dip, in that cafe,will be equal to the angle EDF ; and its values…
Navigation · Nautical astronomy
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