The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1882-03-29
Committee ON Machinery REPORT.
March Dist 1852

Committee ON Machinery Report.
In the limited time al its disposal the COM
mittee has not been able 20 collect the facts and
figures It would be desirable TO place before the
mill owners and Managers but viii present few
items in regard TO improvements in machinery.
which have come under the observation ut ITS
members, which possibly may be worthy %
discussion and investigation Ou the part 90 the
Association. 4 number 81 the most notable de-
partues from the styles Of machinery, and boil
ing house apparatus usually adopted IL the la.l-
on these Islands are to bt found at the maids NJ
the Hawaiian Commercial Company on Mani.
and the results Of some Of these impr3r lmeuts
will De found interesting. We wild present items
in regard to several departments.
CRUSHING 1ueuNEuy.
The first mill erected by the RI. G.. C..'sas Of
the kind known us the Five Roller 1liIl Che first
Of is kiuJ erected ou these Islands, though by
mo- means unknown In Cuba and otlarsuglr rra-
duciug countries aud the result, obtained were
such that the three mills planned subsequently
were made of the same kind. The Hydraulic
Attachment however ON these mills We believe
was applied hero FIRST. By melu- 0i DO tle un-
per rolls are forced down hy hydraulic p.t. ,ule.
SD that the same crushing i9rta i- .N.rtei Uu
small quantity of cane as ou.s ms-a mass. and
iucgularity of feeding does not result in impJl-
feet grinding. The five rollers are urau-sI Iu
two sets. A set of three. and .st Of two. The
set of tuea is similar % any ,lrg roll mill boz
the set Of two, one roll is jire city over Tire other.
the trash from the three roll. is carried hy lu
apron Co the pair, and leaves them dry enough
60 be taken directly 90 the furnaces. The amount
of juice extracted from She trash by the second
set of rollers is lG per cent of that obtained hy
the first set. ill of the c-ue oil the whole crop,
yielding over 200 tons Ut ~ugi-, was weighed l-
it was brought iu ON the ears, and the juice OBJ
tanned was I'll per cent. of the caue.- Ills b.iev-
Cd that there ate not many mills. that can show
an efficiency iu crushing power equal o. tltt- DO
Is unfortunate that mo- other mills have facilities
for weighing cane, So that eXact result, cam he
compared. avery good test Of the efficiency of
any mill can be made however 10y lscertaiuiug
the amount of moisture remaining u the trash
after crushing, weighing 90 quantity ni trash JUST
from the rolls. driving 10 thoroughly. and weigh
ing again. The loss la weight viii be the amount
Of moisture o. be ascertained. Tested iu This
way, the trash from the H. G.. Co.'S Mill was
found to contain IS per cent. Of moisture. or IN
other words from 100 lbs of cane, II lh5 Of juice
were obtained, and Of the residue. m lb5 were
moisture. and Is lbs dry trash. Although the
largest mills crush nearly if not quite Efficient
ly rs this it seems that with the i've roller
rangement q much larger amount Of cane can be
put through in a given time than with the triple
rolls Of the same size.
CANE ENGINE.
The use Of the compound engine. for driving
o mill has not been known anywhere on the Is
lands except at the-H. c. Co. Works. Those
who understand the principles Of the compound
engine will perceive that one result would Be,
very small proportion OF exhaust steam 20 use
afterwards in cleaning or eyaporgtiug. There Is
probably greater economy Of steam in using it
e
at once than TO depend on utilizing q large amount
Of exhaust although il would take careful eNpsr-
iment and more or less intricate calculation, o.
establish the fact. There is no more exhaust es-
Gaping from these engines than barely sufficient
to heat the juice before it passe, into the clean
ing pan.
CLEANING PANS.
\ great variety Of cleaning pans are use ON
these Islands. The latest style Of those made by
the Honolulu Iron Works 10 excellent work.
The pans are about II feet long, feet wids and
, feet deep, with % copper coil in the bottom and
% scum box 40 the end. 10 IS generally admitted
tina. shallow pan. DO better work than deep
ones. both in respect to time and economy ~
steam Some advantages are claimed for cone
tiuuous cleaning in long shallow pans, whore
I the Juice runs I'm constantly a' one end lud ont
at the other. Very economical work In pans ul
this kind Is seen Ht the mill " Alexander 81 bt.d-
at the H. e.. Co.'s mills where tha Juice Is rum
directly into the continuous working pans, i'm
stead Of being heated and SKINNED first iu
I the ordinary CHARTERS. The difficulty Of Inning
the Juice uniformly viii, no doubt. suggest itself
I in this connection, and would call attention
to the apparatus by which this is accomplished.
Z The lime is slaked and mixed with water la Is
| small iron tank, in which revolving arms keeps
| the milk Of the lime agitated. 4 simple device
prevents the the sediment and uuslaked humps
| from being drawn on, and the milk Of the lime
/ is forced into the juice by small piston com
nected with the juice pump. The stroke u the
I small piston Is variable at will, that the
/ amount Of lime-vater mixed with the juice 40
each stroke Of the pump can be accurately regu-
lated, and by this means very thorough mixture
Of the lime with the juice is accomplished.
JUICE srEATSEE.
/ Ithas been noted in the experience Of two MEM
beers Of your committee that the amount " scum
collecting in the CHARTERS, is materially reduced
by the use Of very zine juice -tTainers. In one
instance a change was made from strainef oi
/ sheet copper. with holes one-eighth of an inch
[ in diaineter.to 10 strainer Of copper wire cloth.
[ 80 mesh per inch. At the H. q. Co.'s works. BE-
was found at the first mill that the amount oi
7kmmings when moderately hne sieve was
used, was six times the amount obtained in che
new mill with q strainer 81 centrifugal Inning.
Upon noting this fact the strainer 81 the Old mill
was changed, and the same results were obtained.
a. in the new mill.
EvAroHATrSG APPAEarC-.
Although the double and triple effect eyap0ni-
ANA, ,,,,,.s hove coma irfq t1ao ON these Islands