New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1856-09-23

,yoduce their engines in place OF others TOT tne saving
of fuel in a riven period In the next the james MIL
where both boilers and engines were changed the
compapy were offered a choice between such ana
d.c, mn vmept and were allowed u decide after the
new work was in, readyt start, but before u was
tried The company very naturally decided TO pay ior
,b fue, saved in Eve wears which the results show
uin amount 70 sIS GCO-instead Of $40 800 the pnce
asked. $500.
The James Mill runs II ,G2i spindles, makes A. 600
vards or 10000 pounds of shirtngs per week, with
consumrtion of only y tuns of Goa per day The amount
reoulsry consumed previous to the change was tunS
The efficiency of these fuel in this mil has nearly
doubled as the production OF cloth las increased some
our or FIVE per cent since the change In TINS case the
boilers also were changed, and the extraordinary
increase Of economy above hatn the other cases may
probably b. ascribed to this cause.
Tho Increase of work in the first mill is due partly to
~ addition Of machinery, throwing OF course greater
load upon the engines but in the last instance is
o,,r;butalle solely to the increased speed allowed in
consequence of more steady Notwithstanding that all
nr,ct;cel difficulties have been provided for, and that
Tho regulation of these engines is effected even more
perfectly than usual.
The common method OF regulating is by the throttle
valve kind of 'damper in the steam pipe, which is
ned
py This is now fully proved to be, as applied to large
engines m uexcusabe relic of barbarism. An engine
,bro,ed nm industrious and faithful horse restrained
ot every moment by a brake applied to the wheels,
and compelled to exert 80 per cent more strength than
il necessary The new system removes the brake ana
nuts the bit in his mouth instead. The old system
spends the youth and fury of the imprisoned vapor in
n violent struggle to pass through narrow opening
.uI,, tba in,le of
pepded in driving the engine The new takes Mt each
stroke large or small quantity of steam according a.
the work REQUIRES and allows to act with aits vigor
There are direct advantages accrung from the care
fl weighing of fuel now generally practiced in these
and other good mills sufficient to amply pay for the
,roube involved A sudden increase in the consump-
,on in one mill so conducted from H. 100 lbs per week
70 Is COG and thence to 10 600 led to careful exam
nation and the discovery of spring broken IN the
hacking of the piston which had caused leak. Such
instances are common in all large seam-mils when no
other indications exist Of any arrangement
The Globe and James Mills, previous TO the change
were driven BY condensing eugines-he large quantity
of water required being drawn through ooo feet OF
pire which il was much trouble To keep IN ORDER
With the increased economy above detailed, IL may
surprise many to learn that the new engines are In
every instance non-condensing. Although this change
in itself would involve q considerably increased con-
sumption of fuel, it is probable that the use OF the
exhaust steam in the process OF dressing the yarn anu
in warming the mills in Winter very nearly, or quite
compensates for the absence of II vacuum. AS now
arranged only the Globe, which is on heavy WORK,
consumes steam fresh from the boilers IN the process Oh
dressing and all the mills are thoroughly warmed by
the exhaust steam alone except on few OF the coolest
mornings when fresh steam is admitted Tor snort
ncr;od The Bartlett and James Mills employ cast
iron mines Of considerable size which involve little or
no appreciate back pressure under ordinary ercum-
stances while the Globe Mil employs small gas-pipe
for the purpose and works with back pressure OF
about threequarers of pound per square inch. Inc
science of warming by steam as connected with steam
power is vet quite mperfecty understood, and these
facts may be of value to some i'll investigating this
question.
Mrcu.yrcs' FAIR AT Bosrox.-The fair of the Me-
chanics Charitable Association at Boston, opened on
the 10th with very creditable display. The rnachn-
ery department is filed with evidence of New-England
| ingenuity the machinery in motion being driven by
large and quite novel engine constructed by the tut
nam Machine Co. of Fitchburgh, Mass. Inc steam
for the purpose is supplied from large boiler teni-
porarlv mounted in the street The buildings occupied
are as usual the whole of the old Cradle OF Liberty
and the whole second story of the Quincy Market the
buildings being connected by bridge, across which,
like the tabled Styx the visitor once passed is not al
lowed to return rule which is in some respects rather
| annoying.
| Among the mass of deserving objects more or less
| novel, we can but notice the most prominent. n.
Gear irregular cutter, machine for executing va
rety of ornamental shapes for furniture, architectural
| embellishments, &C., with great rapidity, has been
radically improved by Mr. l. =. Grosvenor of Lowell,
| Mass by the addition OF very ready means OF rails
ing or lowering the cutting knives to any desired extent
| thereby greatly increasing the variety OF curved
| nodded edges executed by one set OF knives. The
means employed are simply washers, provided each
with grooves their upper surfaces like those on the
fixed collar and with projections on the under surfaces
to lock in said collar. Any quantity of these washers
may be inerposed below any desired form Of cutting
knives, the whole locking together as firmly and as
simply as before.
The Lawrence Machine Company exhibit an admi-
| rable portable engine, which seems to parake in a
very high degree Of the distinguishing feature of their
work-extreme cheapness Both boiler and engine
upright, the boiler being tubular with stout cast
iron steam drum of considerably larger diameter than
the remainder of the she'll thus affordng liberal steam
room in which the spray thrown up by the furously
agtated water may have time TO fall without causing
difficulty by passing with the steam into the engine
The cylinder is above tie crank and the piston rod is
guided by being passed into pump, where its lower
extremity serves plunger. 1t appears cheap and
durable more so than any other offered for general ag
| ricultural and the Like purposes now in mind.
safety hatch which opens and closes itself When
ever the platform is required to ascend or descend
through it, deserving of far more attractive
showing than il has received being only represented