The aerial age : a thousand miles by airship over the Atlantic Ocean; airship voyages over the Polar Sea, the past, the present and the future of aerial navigation (1911)
Wellman, Walter, 1858- · New York : A.R. Keller · leaf 330
iis indicator shows whether ^ve are followingour direct course or swerving from it. For dead reckoning we must depend upon theleeway indicator for direction and the old-fash-ioned harpoon log for speed, casting the log atfrequent intervals, then pulling it in and reading-its dial. This log is a… … PROBLEMS OF XAVIGATIOX 263 long line, the number of revolutions being markedupon a dial indicator. Given the head of the ship by the standardcompass, the actual course bj^ the leeway line,the approximate speed by the harpoon log, andthe normal speed of the sliip in still air, a com-ponent of all…
Aeronautics
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