y the log-line, and, being satisfi'd with that, he
determin'd to throw the log himself. Accordingly some days after, when
the wind blew very fair and fresh, and the captain of the
paquet, Lutwidge, said he believ'd she then went at the rate of
thirteen knots, Kennedy made the experiment, and own'd his wager lost.

[115] A piece of wood shaped and weighted so as to keep it
stable when in the water. To this is attached a line
knotted at regular distances. By these devices it is
possible to tell the speed of a ship.

The above fact I give for the sake of the following observation. It
has been remark'd, as an imperfection in the art of ship-building,
that it can never be known, till she is tried, whether a new ship will
or will not be a good sailer; for that the model of a good-sailing
ship has been exactly follow'd in a new one, which has prov'd, on the
contrary, remarkably dull. I apprehend that this may partly be
occasion'd by the different opinions of seamen respecting the modes of
lading, rigging, and sailing of a ship; each has his system; and the
same vessel, laden by the judgment and orders of one captain, shall
sail better or worse than when by the orders of another. Besides, it
scarce ever happens that a ship is form'd, fitted for the sea, and
sail'd by the same person. One man builds the hull, another rigs her,
a third lades and sails her. No one of these has the advantage of
knowing all the ideas and experience of the others, and, therefore,
cannot draw just conclusions from a combination of the whole.

Even in the simple operation of sailing when at sea, I have often
observ'd different judgments in the officers who commanded the
successive watches, the wind being the same. One would have the sails
trimm'd sharper or flatter than another, so that they seem'd to have
no certain rule to govern by. Yet I think a set of experiments might
be instituted; first, to determine the most proper form of the hull
for swift sailing; next, the best dimensions and properest place for
the masts; then the form and quantity of sails, and their position, as
the wind may be; and, lastly, the disposition of the lading. This is
an age of experiments, and I think a set accurately made and combin'd
would be of great use. I am persuaded, therefore, that ere long some
ingenious philosopher will undertake it, to whom I wish success.

[Illustration: Sailing ship]

We were several times chas'd in our passage, but out-sai