Scientific American Supplement, No. 598, June 18, 1887Various
Science
Scientific American Supplement, No. 598, June 18, 1887
Various
Science -- Periodicals
It may be taken as proved that the present value of the ship is about
£26,000. Mr. De Mattos gave, we understand, £27,000 for her, and he bought
her by auction. The last sale gives nearly the same figures. If we assume
that there are 10,000 tons of iron in her, we may also assume that if
broken up it would not fetch more than £3 a ton at present rates; but even
if we say £4, we have as a total but £40,000. To break the ship up would be
a herculean task; we very much doubt if it could be done for the difference
between £26,000 and £40,000; her engines would only sell for old iron,
being entirely worthless for any other place than the foundry once they
were taken out of her; as for her boilers, the less said about them the
better. In one word, she would not pay to break up. On the other hand, by a
comparatively moderate further outlay, she might be made the finest trading
ship afloat. There are two harbors at all events into which she can always
get, namely, Milford and Sydney. There are others, of course, but these
will do; and the ship could trade between these two ports. By taking out
her paddle engines, she would be relieved of a weight of 850 tons. The
removal of her paddle engine boilers would further lighten her, and would
give in addition an enormous stowage space. By using her both as a cargo
and a passenger ship, the whole of the upper portion could be utilized for
emigrants, let us say, and the lower decks for cargo, of which she could
carry nearly, if not quite, 20,000 tons. She would possess the great
advantage that, notwithstanding she was a cargo ship, she would be nearly,
if not quite, as fast as any, save a few of the most recent additions to
the Australian fleet. There is every reason to believe that she has been
driven at 14 knots by about 6,000 horse power. We are inclined to think
that the power has been overstated, and we have it on good authority that
she has more than once attained a speed of 15 knots. Let us assume,
however, that her speed is to be 13 knots, or about fifteen miles an hour.
Assuming the power required to vary as the cube of the speed, if 6,000
horsepower gave 14 knots, then about 4,800 would give 13 knots--say 5,000
horse power. Now, good compound engines of this power ought not to burn
more than 2 lb. per horse per hour, or say 4.5 tons per hour, or 108 tons a
day. Allowing the trip to Australia to take forty days, we have 4,320 tons
of coal--say 5,000 tons for the trip. The Etruria burns about this quantity
in the run to New York and back. For each ton of coal burned in the Great
Eastern about 15,000 tons of cargo and 3,000 passengers could be moved
about 3-1/3 miles. There is, we need hardly say, nothing afloat which can
compare in economy of fuel with this. Taken on another basis, we may
compare her with an ordinary cargo boat. In such a vessel about 3,000 tons
of grain can be moved at 9 knots an hour for 600 horse power--that is 5
tons of cargo per horse power.
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