value to its masters. There is reason, however, to believe, that to a certain degree, although unacknowledged and in secret, it is made use of as a sort of intermediate trading-place for slaves.
It was on this island that the distinguished Major Sabine conducted his scientific and interesting observations upon the swinging of the pendulum in 1822, as it lies as nearly as possible under the Line.
On the following morning, the 25th, the Nemesis crossed the Line, with the thermometer at 96°, which had been the average temperature for several days. Strong adverse winds prevailed, with a heavy swell for many days afterwards, against which she went ahead very steadily, at the rate of five to five and a half knots an hour; but, as it was desirable to save fuel as much as possible, it was at length determined to make a hitherto untried experiment – viz., to work the lee paddle-wheel only, while under sail, (the other wheel being disconnected, and allowed to revolve by the motion of the vessel,) and also to use only one boiler. She was steered about five and a half points from the wind, and in this position, with a rolling sea and steady breeze, she continued to make head at the rate of six and a half to seven knots an hour, the active or lee paddle-wheel making twelve to fifteen revolutions per minute. Thus the success of the trial was complete, particularly as it appeared to counteract the lee-way of the vessel. The helm did not seem to be materially affected by the unequal force applied to the two sides of the vessel.
Some pains have been taken to ascertain whether both engines could be worked to any good purpose with one boiler. In reply to this question, it appears that, except in the river Mersey, at Liverpool, with all circumstances particularly favourable, the Nemesis was never able to work both engines with one boiler with more than very inconsiderable effect. But it must be very evident that any vessel, having power enough to do so in case of emergency, must possess a great advantage; and there is little doubt that, with twenty or thirty horse power more, she would have been able to accomplish it in smooth water, particularly with sails set. It is therefore to be regretted that her power (only one hundred and twenty horse) was scarcely sufficient for her size and weight.
On the 2nd of June, the ship all at once seemed to be lost to the control of the helmsman, and, no other very good reason suggesting itself, the rudder was naturally examined with care. It was at once discovered that the drop or false rudder had been carried away, but by what means did not sufficiently appear, except that, on examination, there was reason to think it must have been fairly worn through at the point of junction with the lower edge of the upper or true rudder – for at this part nearly the whole strain of its action operated.
No time was to be lost in attempting to repair this injury, as the vessel became almost unmanageable, the true rudder, at times, being nearly above water, in the heavy pitching of the ship. With the utmost exertion on the part of the officers and the intelligent carpenter of the ship, a temporary false rudder was constructed, and securely fixed before nightfall. It was, moreover, found to act even better than the original one, having more hold in the water, as well as a larger surface of attachment to the upper rudder. Subjoined is a plan of this contrivance, which will almost suffice to explain its ingenuity. It was made of planks of wood, instead of solid iron, and was secured by chains, in such a manner as to grasp the upper or true rudder firmly, while it could also be raised or lowered at pleasure.
The whole apparatus was found to answer remarkably well, and, during the remainder of the voyage to the Cape, (and that a trying one,) it never got out of order, or required additional support. Indeed, it was remarked by every one, that the vessel was more easily steered than it had been before.
But the difficulties which the Nemesis had to encounter were not yet ended. Strong breezes from the southward still prevailed, without any prospect of a speedy change; her progress was slow, and there only remained on board thirty-two tons of coal, with a little wood; nor was there any place at hand to which she could run for fuel. It was therefore resolved to stand out to sea, trusting to her canvas only. Thus her remaining fuel would be reserved for any emergency, and would suffice to ensure her being able to get into port when within a reasonable distance. A reference to the map will shew her position at this time.
As much sail was set as she could carry, and her course was altered according to the wind. Away stood the fearless Nemesis, disdaining the land, and boldly venturing out to dare the stormy seas of those regions in the depth of winter. The heavy winds from the southward, which had so long prevailed, had baffled all the usual calculations.
On the first day of their standing away, it became more than ever apparent that, being very light, and in fact scarcely drawing five feet and a half of water, as she was really flat-bottomed, the vessel fell so much to leeward, that she made very little progress on a wind and in a heavy sea; and, in short, that her deep moveable keels were far from sufficient to counteract this tendency. It therefore became of the utmost importance to endeavour to invent some additional means of remedying this inconvenience.
Calling to mind his former experience on the coast of Holland, and remembering the great advantage which the flat-bottomed Dutch vessels derive from the use of their lee-boards, when sailing in light winds or close hauled, with a head sea, it occurred to the commander that something of a similar kind might be adopted on the present occasion. The officers concurred in this suggestion; and when all are animated with the same cordial and enterprising spirit, few things are found to be so difficult as they at first appear. It is the mutual reliance upon each other, in the moment of difficulty, which enables British seamen boldly and successfully to brave many perils which a moment's doubt or hesitation might render insurmountable.
The above diagram will sufficiently explain the nature of the contrivance adopted on this occasion, without the assistance of minute and tedious description. It is only necessary to remark, that in addition to the four chains which are seen in the plan, a fifth was found necessary, to keep the lee-board close to the side of the vessel. It was secured to the lower end of the lee-board at its centre, and, having then been carried across the vessel's bottom, was fastened to the opposite side by a rope and tackle.
Thus equipped, the Nemesis proceeded on her voyage, and was found to derive great assistance from this new contrivance. It was found that her lee-way was reduced fully one-half, as ascertained by careful observation.5
Gradually the breeze freshened on the subsequent days, until, at last, about the 18th, it amounted to a moderate gale, with that high and heavy sea which all who have visited the Cape will long remember, threatening, every now and then, to break on board or poop the ship; but the steady little vessel rose to it like a swan, and never shipped one heavy or dangerous sea.
Confidence in all her qualities daily increased, and, with a strong breeze on the quarter, she was now sailing, under canvas only, at the rate of eight to nine and a half knots an hour. The lee-board was found at all times useful in making the ship stanch under sail, but as it was constructed in haste, and only with such materials as were at hand, it required to be repaired and strengthened several times.
At length, on the 29th, being still two hundred and thirty miles from the Cape, but well down to the southward, and it appearing that there was sufficient fuel left to carry her into port, the steam was for the last time got up. On the morning of the 1st July, the remarkable land of the Table Mountain, and the conical peak to the southward of it, were well in sight. The Nemesis had made a long and tiresome voyage in the most unfavourable season of the year, and the anxiety which had been shared by all on board may well be conceived. The dangers of the Cape, at that time of year, have not been exaggerated. On the 1st July, much to the astonishment of every one at Cape Town, she was descried, late in the evening, quietly steaming into Table Bay.
CHAPTER III
During the winter season, few vessels, and those only of light burden, venture into Table Bay, exposed as it is to the full fury of the north-west gales. But the Nemesis had little cause for fear; her light draught of water enabling her to anchor in a well-sheltered cove, near
Another remark, perhaps worthy of being attended to, suggested itself on this occasion, and it has been frequently confirmed since – namely, that no steamer constructed according to the model of the Nemesis should be sent to sea upon a long and uncertain voyage, without having a
It may further be questionable, in the event of a smaller steamer being intended to be sent out, whether it would not be both safer and less expensive to send it
