. Fig. 16. La via della nave lungo la barriera di ghiaccio e la costa dell'Antartico, tra le longitudini di 0° 10' e 4° 30' E. registrazione continua di punti di scandaglio in tutto. Poco dopo il ritorno alla barriera la nave era costretto a nord da un campo di bergs circondato da pesanti pack-ghiaccio e punti di scandaglio ha raggiunto un massimo di loiofm. (1847 m.) a 69° 54-8' 8, 03° immissione 32-1' E. Da questa posizione i punti di scandaglio di nuovo shoaled rapidamente verso la terra e dopo un costante pendenza di una profondità di 60 fm. (N. m.) è stato ottenuto 3 cavi off-shore, in 70° 0' S, 03° 49-2' E. Terra era di nuovo avvicinata a poche miglia più lontano e

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. Fig. 16. Track of ship along ice barrier and coast of Antarctica, between the longitudes of 0° 10' E and 4° 30' E. Continuous recording of soundings throughout. Shortly after the return to the barrier the ship was forced to the north by a field of bergs surrounded by heavy pack-ice, and soundings reached a maximum of loiofm. (1847 m.) in 69° 54-8' 8, 03° 32-1' E. From this position the soundings again shoaled rapidly towards the land and after a steady slope a depth of 60 fm. (no m.) was obtained 3 cables off-shore, in 70° 04-6' S, 03° 49-2' E. Land was again approached a few miles farther east and the least sounding obtained was 117 fm. (214 m.). Course was then altered to avoid pack-ice and to stand off the coast during the dark hours, but the weather deteriorated rapidly during the night and it was not possible to resume the survey. THE CONTINENTAL SHELF OF ANTARCTICA This short survey of 140 miles of the ice barrier revealed the interesting fact that over this distance there was virtually no continental shelf in the sense generally understood. Unfortunately, the pack-ice which surrounds the Antarctic Continent throughout the greater part of the year in most sectors makes the approach difficult, and it is only during late summer or autumn that ships can expect to close the land. It is not possible, without much more information than we now possess, to forecast, even remotely, the incidence of pack-ice, and thus any approach to the continent will remain for some years largely a matter of chance. Aerial reconnaissance, however, would be of considerable assistance in a clear ice year. The information which has already been obtained from various approaches to the Antarctic Continent, and from running surveys of some short sections of the coast, leads us to believe that in some places the continental shelf is almost completely absent; one such area has just been described. Similar conditions are to be found in other parts of the Atlantic sector, and over consi

Parole chiave associate all'immagine

• bookcentury1900
• booksubjectocean
• booksubjectscientificexpediti