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 249
by phenomenal drifts, passed into European waters and been encountered from timeto time throughout that portion of the ocean which stretches from the British Islesto the Azores. Icebergs assume the greatest variety of shapes, from those approximatmg tosome regular geometric figure to others crowned… … jecting ledge. They frequently have outlying spurs under water, which are asdangerous as any other sunken reefs. For this reason it is advisable for vessels togive them a wide berth, for there are cases on record where vessels were seriouslydamaged by striking when apparently clear of the berg.…
Navigation · Nautical astronomy
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