The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1885-06-10

avs. IEIU gearing or uuU MN UrulKs, VI ruu
works. done under perilous conditions that we are
all striving TO avoid
For the poor results of toe thin feed there has
heretofore been no remedy, excepting the use of
heavier and more rigid mills in which there could
be but little If any sprIpg of the bolts. This
seemed an expensive remedy to apply where bnt
little work was to be done, and where economy in
the outfit was essential
For the disasters resulting from too thick feed
there has heretofore been no remedy, except to in
crease the strength of each part when broken
This increased strength gives increased confidence
and usually the feed is increased and the chapter
OF disasters Is again repeated; and this has gone
on from year to year until now we feel we can no
longer endure it.
Very few persons appreciate the enormous strain
upon cane mill by an excessive feed. 1t must be
crushed, ground to powder and go through, or the
mill must stop or break. Even for ordinary work
our cane mills must have double the strength
ordinarily used, and they frequently have three or
four times the strength ordinarily used, and vet
give way when suddenly halted by an excess of iced
Ii all this strength, unused except in the emer-
gency of excessive feeding could be constantly ap
piled to the extraction of juice, We should
enormously increase that extraction; and herein
develops the merit of the Mcdonald hydraulic
pressure regulator. Having determined Just what
pressure you think your gearing and mill will
safely stand, your top roller is loaded with that
weight, and there it remains constantly. If there
be no feed in the mill the one hundred tons or
more hang on to the bolts all the time and maiu-
tam tlAt ltllslOus All Snrlng the
bolts, and the less the feed the better the bagasse
If but one cane goes through, the one hundred or
more tons of pressure are concentrated on it. The
larger the feed the less good is the bagasse be.
cause you are exertng thereon your standard pres
sure of, say 100 tons, and now you begin to insist
on no excess of feed, but to countenance occasio-
nal Deficiencies in feed the thin spots give the
highest extraction
Surely this is a revolution in our industry
Heretofore to apply one hundred tons pressure we
had to have strength up to three hundred or four
mndred tons; and, fearing breakage, we applied
not over sixty or seyenty-tYe tons pressure most
of the time thinner feed, through rigid OPEN
ing, of course, developing less pressure Now
when we want to apply one hundred tons pressure
It Is there all tine tmeneYer less, be the feed ever
SO thin, and never greater no matter how thick the
feed may be, for the device works easily, and the
thicker feed simply opens The rolls and passes
through with no more strain than with the thin
feed.
believe there is not a cane mill in Louisiana.
except those now using the hydraulic device that
does not, ut some time every day in the grinding
season, stand double its ordinary strain. If they
have then, this double strength lying ready for
emergencies, why not do away with the eInergeu-
cles and use the double strength all the time? You
can thus double the average pressure exerted by
every cane mil IL Louisiana. An old cane mill
with the hydraulic device, is better than a some
what larger new without it. 1t will give a
higher percentage of extraction. Whatever capa-
city or strength the mill has is utilized all the
time. There ere no periods of light pressure, of
light work. and>one of the noticeable results Is the
increased consumption of fuel at the mill buffers
required by the increased work of the mill
For some ten years past have used double
mill, and IN previous years never exceeded sixty
eight per cent, average extraction for an entire
campaign. During the season recently ended /
ground over 10000 tons Of cane, and obtained an
average extraction a shade above seTenty-two Der
cent, thus showing a gain of about six per cent
over the best previous results and equal on 2OOOj
tons Of cane to loo tons additional | believe
this gain resulted from the use of the hydraulic
device.