the open air stood at 75–½; and when immerged in the surface of the sea, at 74; but when immerged eighty fathoms deep (where it remained fifteen minutes) when it came up, the mercury stood at 66. At the same time we sounded, without out finding the bottom, with a line of two hundred and fifty fathoms.
The calm was succeeded by a light breeze at S.W., which kept veering by little and little to the south, and at last to the eastward of south, attended with clear serene weather.
1772 September
At length, on the 8th of September, we crossed the Line in the longitude of 8° W.; after which, the ceremony of ducking, &c., generally practised on this occasion, was not omitted.
The wind now veering more and more to the east, and blowing a gentle top- gallant gale, in eight days it carried us into the latitude 9° 30' S., longitude 18° W. The weather was pleasant; and we daily saw some of those birds which are looked upon as signs of the vicinity of land; such as boobies, man of war, tropic birds, and gannets. We supposed they came from the isle of St. Matthew, or Ascension; which isles we must have passed at no great distance.
On the 27th, in the latitude of 25° 29', longitude 24° 54', we discovered a sail to the west standing after us. She was a snow; and the colours she shewed, either a Portuguese or St. George's ensign, the distance being too great to distinguish the one from the other, and I did not choose to wait to get nearer, or to speak with her.
The wind now began to be variable. It first veered to the north, where it remained two days with fair weather. Afterwards it came round by the west to the south, where it remained two days longer, and, after a few hours calm, sprung up at S.W. But here it remained not long, before it veered to S.E.E. and to the north of east; blew fresh, and by squalls, with showers of rain.
1772 October
With these winds we advanced but slowly; and, without meeting with anything remarkable till the 11th of October, when, at 6h 24m 12s, by Mr. Kendal's watch, the moon rose about four digits eclipsed, and soon after we prepared to observe the end of the eclipse, as follows, viz.
h. m. s.
By me at 6 53 51 with a common refractor.
By Mr. Forster 6 55 23
By Mr. Wales 6 54 57 quadrant telescope.
By Mr. Pickersgill 6 55 30 three feet refractor.
By Mr. Gilert 6 53 24 naked eye.
By Mr. Hervey 6 55 34 quadrant telescope.
————
Mean 6 54 46–½ by the watch.
Watch slow of apparent time 0 3 59
————
Apparent time 6 58 45–½ end of the eclipse.
Ditto 7 25 0 at Greenwich.
————
Dif. of longitude 0 26 14–½ == 6° 33' 30"
The longitude observed by Mr. Wales, was
By the and Aquilae 5° 51' |
By the and Adebaran 6° 35 |Mean 6° 13' 0"
By Mr. Kendal's watch 6° 53⅞
The next morning, having but little wind, we hoisted a boat out, to try if there was any current, but found none. From this time to the 16th, we had the wind between the north and east, a gentle gale. We had for some time ceased to see any of the birds before-mentioned; and were now accompanied by albatrosses, pintadoes, sheerwaters, &c., and a small grey peterel, less than a pigeon. It has a whitish belly, and grey back, with a black stroke across from the tip of one wing to the tip of the other. These birds sometimes visited us in great flights. They are, as well as the pintadoes, southern birds; and are, I believe, never seen within the tropics, or north of the Line.
On the 17th, we saw a sail to the N.W., standing to the eastward, which hoisted Dutch colours. She kept us company for two days, but the third we outsailed her.
On the 21st, at 7h. 30m. 20s. a, m., our longitude, by the mean of two observed distances of the sun and moon, was 8° 4' 30" E., Mr. Kendal's watch at the same time gave 7° 22'. Our latitude was 35° 20' N. The wind was now easterly, and continued so till the 23d, when it veered to N. and N.W. after some hours calm; in which we put a boat in the water, and Mr. Forster shot some albatrosses and other birds, on which we feasted the next day, and found them exceedingly good. At the same time we saw a seal, or, as some thought, a sea-lion, which probably might be an inhabitant of one of the isles of Tristian de Cunhah, being now nearly in their latitude, and about 5° east of them.
The wind continued but two days at N.W. and S.W.; then veered to the S.E., where it remained two days longer; then fixed at N.W., which carried us to our intended port. As we approached the land, the sea-fowl, which had accompanied us hitherto, began to leave us; at least they did not come in such numbers. Nor did we see gannets, or the black bird, commonly called the Cape Hen, till we were nearly within sight of the Cape. Nor did we strike sounding till Penguin Island bore N.N.E., distant two or three leagues, where we had fifty fathom water. Not but that the soundings may extend farther off. However, I am very sure that they do not extend very far west from the Cape. For we could not find ground with a line of 210 fathoms, twenty-five leagues west of Table-Bay; the same at thirty-five leagues, and at sixty-four leagues. I sounded these three times, in order to find a bank, which, I had been told, lies to the west of the cape; but how far I never could learn.
I was told before I left England, by some gentlemen who were well enough acquainted with the navigation between England and the Cape of Good Hope, that I sailed at an improper season of the year; and that I should meet with much calm weather, near and under the Line. This probably may be the case some years. It is, however, not general. On the contrary, we hardly met with any calms; but a brisk S.W. wind in those very latitudes where the calms are expected. Nor did we meet with any of those tornadoes, so much spoken of by other navigators. However, what they have said of the current setting towards the coast of Guinea, as you approach that shore, is true. For, from the time of our leaving St. Jago, to our arrival into the latitude of 1–½° N., which was eleven days, we were carried by the current 3° of longitude more east than our reckoning. On the other hand, after we had crossed the Line, and got the S.E. trade-wind, we always found, by observation, that the ship outstripped the reckoning, which we judged to be owing to a current setting between the south and west. But, upon the whole, the currents in this run seemed to balance each other; for upon our arrival at the Cape, the difference of longitude by dead reckoning kept from England, without once being corrected, was only three quarters of a degree less than that by observation.
At two in the afternoon on the 29th, we made the land of the Cape of Good Hope. The Table Mountain, which is over the Cape Town, bore E.S.E., distance twelve or fourteen leagues. At this time it was a good deal obscured by clouds, otherwise it might, from its height, have been seen at a much greater distance. We now crowded all the sail we could, thinking to get into the bay before dark. But when we found this could not be accomplished, we shortened sail, and spent the night standing off and on. Between eight and nine o'clock, the whole sea, within the compass of our sight, became at once, as it were illuminated; or, what the seamen call, all on fire. This appearance of the sea, in some degree, is very common; but the cause is not so generally known. Mr. Banks and Dr. Solander had satisfied me that it was occasioned by sea-insects. Mr. Forster, however, seemed not to favour this opinion. I therefore had some buckets of water drawn up from alongside the ship, which we found full of an innumerable quantity of small globular insects, about the size of a common pin's-head, and quite transparent. There was no doubt of their being living animals, when in their own proper element, though we could not perceive any life in them: Mr. Forster, whose province it is more minutely to describe things of this nature, was now well satisfied with the cause of the sea's illumination.
At length day-light came and brought us fair weather; and having stood into Table Bay, with the Adventure in company, we anchored in five fathom water. We afterwards moored N.E. and S.W., Green Point on the west point of the bay, bearing N.W. by W., and