Читать книгу The Journey to the Polar Sea - Franklin John - Страница 25

By the 25th July we had opened the entrance of Davis Straits and in the afternoon spoke the Andrew Marvell, bound to England with a cargo of fourteen fish. The master informed us that the ice had been heavier this season in Davis Straits than he had ever recollected, and that it lay particularly close to the westward, being connected with the shore to the northward of Resolution Island and extending from thence within a short distance of the Greenland coast; that whales had been abundant but the ice so extremely cross that few could be killed. His ship, as well as several others, had suffered material injury, and two vessels had been entirely crushed between vast masses of ice in latitude 74 degrees 40 minutes North, but the crews were saved. We inquired anxiously but in vain for intelligence respecting Lieutenant Parry and the ships under his command; but as he mentioned that the wind had been blowing strong from the northward for some time, which would probably have cleared Baffin's Bay of ice, we were disposed to hope favourably of his progress.

The clouds assumed so much the appearance of icebergs this evening as to deceive most of the passengers and crew; but their imaginations had been excited by the intelligence we had received from the Andrew Marvell that she had only parted from a cluster of them two days previous to our meeting.

On the 27th, being in latitude 57 degrees 44 minutes 21 seconds North, longitude 47 degrees 31 minutes 14 seconds West and the weather calm, we tried our soundings but did not reach the bottom. The register thermometer was attached to the line just above the lead, and is supposed to have descended six hundred and fifty fathoms. A well-corked bottle was also fastened to the line two hundred fathoms above the lead and went down four hundred and fifty fathoms. The change in temperature shown by the register thermometer during the descent was from 52 to 40.5 degrees; and it stood at the latter point when taken out of the tin case. The temperature of the water brought up in the bottle was 41 degrees, being half a degree higher at four hundred and fifty than at six hundred and fifty fathoms and four degrees colder than the water at the surface which was then at 45 degrees, whilst that of the air was 46 degrees. This experiment in showing the water to be colder at a great depth than at the surface, and in proportion to the increase of the descent, coincides with the observations of Captain Ross and Lieutenant Parry on their late voyage to these seas, but is contrary to the results obtained by Captain Buchan and myself on our recent voyage to the north between Spitzbergen and Greenland, in which sea we invariably found the water brought from any great depth to be warmer than that at the surface.

On the 28th we tacked to avoid an extensive stream of sailing ice. The temperature of the water fell to 39.5 degrees when we were near it, but was at 41 degrees when at the distance of half a mile. The thermometer in the air remained steadily at 40 degrees. Thus the proximity of this ice was not so decidedly indicated by the decrease of the temperature of either the air or water as I have before witnessed, which was probably owing to the recent arrival of the stream at this point and its passing at too quick a rate for the effectual diffusion of its chilling influence beyond a short distance. Still the decrease in both cases was sufficient to have given timely warning for a ship's performing any evolution that would have prevented the coming in contact with it had the thickness of the weather precluded a distant view of the danger.

The approach to ice would be more evidently pointed out in the Atlantic, or wherever the surface is not so continually chilled by the passing and the melting of ice as in this sea; and I should strongly recommend a strict hourly attention to the thermometrical state of the water at the surface in all parts where ships are exposed to the dangerous concussion of sailing icebergs, as a principal means of security.

The following day our ship came near another stream of ice and the approach to it was indicated by a decrease of the temperature of the water at the surface from 44 to 42 degrees. A small pine-tree was picked up much shattered by the ice. In the afternoon of the 30th a very dense fog came on; and about six P.M. when sailing before a fresh breeze we were suddenly involved in a heavy stream of ice. Considerable difficulty was experienced in steering through the narrow channels between the different masses in this foggy weather, and the ship received several severe blows.

The water, as usual in the centre of the stream, was quite smooth, but we heard the waves beating violently against the outer edge of the ice. There was some earthy matter on several of the pieces, and the whole body bore the appearance of recent separation from the land. In the space of two hours we again got into the open sea, but had left our two consorts far behind; they followed our track by the guns we discharged. The temperature of the surface water was 35 degrees when amongst the ice, 38 degrees when just clear of it, and 41.5 degrees at two miles distant.

On the 4th of August, when in latitude 59 degrees 58 minutes North, longitude 59 degrees 53 minutes West, we first fell in with large icebergs; and in the evening were encompassed by several of considerable magnitude, which obliged us to tack the ship in order to prevent our getting entangled amongst them. The estimated distance from the nearest part of the Labrador coast was then eighty-eight miles; here we tried for soundings without gaining the bottom. The ship passed through some strong ripplings, which evidently indicated a current, but its direction was not ascertained. We found however by the recent observations that the ship had been set daily to the southward since we had opened Davis Straits. The variation of the compass was observed to be 52 degrees 41 minutes West.

At nine P.M. brilliant coruscations of the Aurora Borealis appeared, of a pale ochre colour with a slight tinge of red, in an arched form, crossing the zenith from North-West to South-East, but afterwards they assumed various shapes and had a rapid motion.

On the 5th of August a party of the officers endeavoured to get on one of the larger icebergs, but ineffectually, owing to the steepness and smoothness of its sides and the swell produced by its undulating motion. This was one of the largest we saw, and Mr. Hood ascertained its height to be one hundred and forty-nine feet; but these masses of ice are frequently magnified to an immense size through the illusive medium of a hazy atmosphere, and on this account their dimensions have often been exaggerated by voyagers.