, 1874-11-11

has much to do with success, because the
longer the season the smaller the capital re-
CURED 10 turn out a given quantity of sugar,
and the smaller the profit needed per ton
of sugar.
1t is also important to know whether night
work is ever done on the Island, and if there
is likely to be any difficulty in the way of
getting abundant apd efficient labour at night,
for a Factory certainly ought to work night
and day if it is to pay well.
OF course the price at which the canes are
s)ld to the Factory, is q most important ele.
ment in the question. We have good autbori.
ty for stating that the late Mr.. Gail declined
to take any interest in any factory paving
moro than s per cent, for Its canes although
the system Of duties in France practically
protects usine sugars to some extent.
The system of payment ought to be one
which should make the planter interested in
the success OF the usine. For instance, he
might receive five per cent for his canes, and
a share of the profit after paving moderate
interest on capital. Thus 1t would he to his
interest to grow as sweet canes as possible and
to deliver them as they we're needed by the
Factory. As you doubtless know, some of the
French Factories have suffered from the plant
ers being interested only in The weight of sugar
made from it.
We are more and more convinced that the
use of charcoal ought to be avoided in the
tropics wherever it is possible. With charcoal
there is of course much sweet water (Char-
Washings) to be concentrated this, together
with the returning of the char, consumes much
fuel. Its use adds considerably to the cost
OF the plant 1t needs attention, which is rare
~ TO be had, and is in other respects OBJ
jectionable.
Where the triple. effect S employed, there
is of course no choice charcoal must then be
used, because without it, the tubes of the nm.
pQratus would become clOgged up with lime.
salts very much more rapidly than even at
present.
Where, however, the Ooncretor Is used for
concentrating, the necessity for the use Of char
disappears. Syrup prepared by the Concre-
tor Is brighter and better than that from the
triple-efect, and the Concretor furnace is far
better suited for burning wet Megass as it
comes from the Mill, than the locomotive fur
naces in which a portion of this material.
along with coal, is burnt in the French Cen
trail Factories.
You will see therefore, that we have no
hesitation in confirming you in your views as
to the superiority Of the concretor to the triple
effect for reducing the juice to syrup.
we nave ht6ed up q number of COncretOr
and Vacuum-pan Factories, which we under
stand are giving very good results. The fol.
lowing is an extract from a letter received
about two months ago, as to the working of the
Concretor and Vacuum-pan Factory illustrated
in the newspaper "Ir0n," a short time ago: -
AS far as the working of the Machinery is
concerned, there is nothing to be desired.
The Mil is the most perfect thing of the kind
| have yet seen, and fills seven CHARTERS per
hour with The greatest ease, (cIarifer-capaci.
ty, $50 gals each) and l would guarantee to
get eight, by driving her. When working
with the Ooncretor3, before the Vacuum-Pan
were erected, l have made $4,000 lbs. Musco-
vado per day, and l believe the apparatus
can be worked up to 10000 per 10 hours. We
shall turn out as good q sugar, If NOS better.
than that turned out from the Killieux trains
with charcoal filtration and triple-efect
eVaporators.'
There is no doubt that a we'll designed and
well-managed Central Factory will give very
much better results than can be obtained with
the ordinary Muscovado process, but the mar
gin is not so great between the results which
are to be expected from it and those obtainable
by a Planter who makes Concrete. This is
surprising the conditions of sale to be equal,
and that the sugar made must in any case go
to Europe. If. however. the whole nroduck