The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1899-11-28
SUGAR MAKING
Comparative Cost Of Lo-
cal and Cuban Mills.
Aboseact OF Mr.. Rsnton's Report
Various Subjects Considered
-otatissios.

The report of the Committee on Man
u6actures read by Geo. +. Renton be-
1ore the Planters Association this
month contains much valuable infor-
mation. Tables embodying general
mill statistics, OF fourteen mills, where
extraction is by the means OF rollers
and OF one where diffusion is still used
ere given. In commenting thereon Mr.
Renton says:
Conditions vary so much with local
ity that 1t is not proper to draw COM
parisons. Methods Of arriving at ex-
traction differ; quantity Of cane hand
led by the same sized plant in differ
ent localities vary. However some
thing Is to be learned in manipulation
from factory whose waste molasses is
Of 33.2 per cent purity and from an
other where powerful machinery and
probably constant vigilance give an
extraction of over "a per cent.
THE question Of Juice purity is
we'll worth pondering over: the plan
tiers are aiming, first at the production
Of canes with the highest percentage Of
sugar, and, secondly. at the grinding
Of those canes when in their best con-
dition."
In regard TO the first. the report
states that 1t was matter for future
study. In speaking OF the second Mr..
RentOn gives statistics showing that
March, April, May and June are the
months Of greatest Juice purity. while
February and July stand second, and
January and August give the lowest
Juice returns. Regarding this the re-
port says ahat the Committee wishes
20 draw especial attention that the
month OF January, when grinding be-
gins, has, under normal conditions,
very little to recommend 1t. from the
standpoint OF juice purity and conse-
quent sugar returns. in comparison
with the later months.
Tho question OF extraction is given
careful consideration at the conclusion
Of which the Committee recommends
that another committee be appointed
% take the subject up and report at
the next meeting. The subjects Of Cla-
Filter Pressing. Crystaliza-
tion In Motion, Fermentation and Gen.
eral Work are fully handled.
Under the latter head Mr.. Renton
SAYS:
All Of the factories work over their
thirds, some portion Of seconds.
This is generally accomplished by re-
melting the lower grades; a few how
ever put their thirds back in the pan
dry on which to build grain. The plan
Of remelting involves the removal of
certain OF the impurities and seems on
general principles to 70 more advan-
tageous. As the fear that lower grades.
when worked over with the juice,
might interfere with the keeping quail
ties Of the sugar appears to have been
removed; the time probably soon will
be, with the tendency Of the age to-
wards large pans and slow boiling.
when but one grade will be shipped
from the sugar house. Probably even
now the reason for not working over
the lower classes of seconds, II sifted
down. will be found to be lack OF either
ssssf H.in inpt nj % n
centrifugals, or OF both.
The necessity for rejection of the not
only n0oproductive, but injurious cane
top in the field, being apparent. the
following system for controlling this
has been adopted at the Eva Mill this
year. The suggestion Is made that II
be tried elsewhere where there ischem-
ical control. 1t consists merely in
the testing by the chemists, twice a
week. of an average lot of the upper
most joints OF the cane at the mill car
rier for determination OF their Juice
purity and sucrose. Recommendation
TO the field oyerseers follow, to cut
higher or lower according TO the tests
made.
Through the courtesy OF Mr.. J. n. s.
Williams We have received a statement
Of Sugar House Control and OF the cost
of sugar manufacture In a Cuban MIL
This latter statement coming from q
competitor country should be OF great
interest 10 us.
A comparison, per ton, Of Cuban Mil
with the EVA Mil cost Is given here
1895, 1899
cuban MIL, Eva Mil.
5000 tons, 22,3OO otns,
Unskilled labor liI 30
Skilled labor 90, 10 ,3s