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.
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