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.