Some twenty-five years ago two ocean steamships
came into collision off the coast of Newfoundland; one sank with
all on board, the other was saved in consequence of having the
hull divided by iron bulkheads into water-tight compartments.
Though the bottom was crushed in the water, it would only fill
the compartment where the break was, and so the steamship came
safely to port. This then novel improvement in the art of ship-building
was brought into such conspicuous notice by that occurrence, and
its merits were so palpable, that from that time steamships have
been almost universally built with water-tight bulkheads.
Like most other supposed "modern" inventions, this was
known to the ancient Hindus; and in quoting what follows from
the narrative of the famous now respected and credited Venetian
traveller of the thirteenth century, Ser Marco Polo,1
we express the hope that this may serve as one more inducement
to young India to respect their ancestors according to their deserts:
Some ships
of the larger class have, besides (the cabins), to
the number of thirteen bulkheads or divisions in the hold, formed
of thick planks let into each other (incastrati, mortised
or rabbeted). The object of these is to guard against accidents
which may occasion the vessel to spring a leak, such as striking
on a rock or receiving a stroke from a whale, a circumstance that
not unfrequently occurs; for, when sailing at night, the motion
through the waves causes a white foam that attracts the notice
of the hungry animal. In expectation of meeting with food, it
rushes violently to the spot, strikes the ship, and often forces
in some part of the bottom. The water, running in at the place
where the injury has been sustained, makes its way to the well
which is always kept clear. The crew, upon discovering the situation
of the leak, immediately remove the goods from the division affected
by the water, which, in consequence of the boards being so well
fitted, cannot pass from one division to another. They then repair
the damage, and return the goods to the place in the hold from
whence they had been taken. The ships are all double-planked;
that is, they have a course of sheathing-boards laid over the
planking in every part. These are caulked with oakum both withinside
and without, and are fastened with iron nails. They are not coated
with pitch, as the country does not produce that article, but
the bottoms are smeared over with the following preparations: The
people take quick-lime and hemp, which latter they cut small,
and with these, when pounded together, they mix oil procured from
a certain tree, making of the whole a kind of unguent, which retains
its viscous property more firmly, and is a better material than
pitch.
Theosophist November, 1881
H. P. Blavatsky
1 The Travels of Marco Polo, the Venetian. Edited
by Thomas Wright, Esq., M.A., F.S.A., etc., Corresponding Member
of the Institute of France. London, 1854. back to
text
|