"Wait a little, till my work is finished," replied I, "and you will see it is more to be depended on than this broken vessel."
I sought out a long flexible plank, and arranged eight tubs on it, close to each other, leaving a piece at each end to form a curve upwards, like the keel of a vessel. We then nailed them firmly to the plank, and to each other. We nailed a plank at each side, of the same length as the first, and succeeded in producing a sort of boat, divided into eight compartments, in which it did not appear difficult to make a short voyage, over a calm sea.
But, unluckily, our wonderful vessel proved so heavy, that our united efforts could not move it an inch. I sent Fritz to bring me the jack-screw, and, in the mean time, sawed a thick round pole into pieces; then raising the fore-part of our work by means of the powerful machine, Fritz placed one of these rollers under it.
Ernest was very anxious to know how this small machine could accomplish more than our united strength. I explained to him, as well as I could, the power of the lever of Archimedes, with which he had declared he could move the world, if he had but a point to rest it on; and I promised my son to take the machine to pieces when we were on shore, and explain the mode of operation. I then told them that God, to compensate for the weakness of man, had bestowed on him reason, invention, and skill in workmanship. The result of these had produced a science which, under the name of Mechanics, taught us to increase and extend our limited powers incredibly by the aid of instruments.
Jack remarked that the jack-screw worked very slowly.
