New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1856-02-07

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tey Hieht be II veuto and tbe proprietor. OF ysao1'
vetla se.erie N some newaIer hey w2ela -. s
do themselves 10 injury.
/ NAcEEszIE's BLowISG MAcHTSE.-There i in daily
operation at the oundery of Mes-rs. X. Hoe Co. in
this city, and at several founderes in jersey City,
rotary machine for forcing air much superior 70 Gny
before introduced. l, the invention of Mr. Philip
W Mackenzie Of the latter place, and has nowbeen
practically tested some eighteen months. The blow
Low in are Of two classes the bellows AMI the
fan. The fan blower in various forms and proportions
is driven at high velocity and drives large volume
OF air with force sufficient for ventating mines or
buildings, blowing away the chat in winnovns grain,
or enlvenipg the free of b'ackniths open forge
But where the air IS TO be driven with any consider
able pressure force, in supplying divers at con-
siderable depths in the sea- or blowing blast furnaces
for making iron, some form OF the bellows or OF the
pumping cylinder is almost invariably employed. The
interior Of blast furnace IS fled some forty feet IN
hight with mingled mass of ore, COAL and limestone,
ard the blast forced in the base requires pres
cure OF from one.aId ahalf to nine pounds per squsre
| inch to rise through it, Fan blowers rarely yield
pressure Of more than from three ten ounces per
square inch, but the pumping cylinder may compress
the elastic fluid to any extent desired The fan is, how
D
duced an attempt to increase the pressure by blowing
from into another thus raising the pressure
few inches with each ill., This is an English plan
ard tie effect Observed was an increase of pressure
pretty nearly equal for each fan passed through. Iu
this country our blast furnaces are generally blown by
pumping ard cupola furnaces, which require leS'
pressure, by fans.
Msckerzies blower includes two cylinders placed
exoertrically one within the other The outer one is
fixed but the inner revoves, ard in doing pro-
tiuGes blades wings to such extent as always to
iust wipe the interior of the fst. The ends beng
c'1sed, ard two liberal openings made in the sides OF
the external cylinder, the air IS drawn in through one
oJc1irc ard expelled through the other whatever may
BE- the degree OF resistance irterpo'ed.
The fixed cylinder or external case Of the blower at
Hoes ourdery is forty inches in diameter, end thirty-X
inches lorg The internal cylinder ia thirty inches IN
diameter ind carries three wings Of haiI-inch boiler
iron The center on which the internal cylinder re-
wolves is five inch, from the true center the case, and
tie surfaces consequently in contact at one point,
while on the opposite side they ten inches apart.
The protruson and withdrawal Of the wings is per-
formed by very simple device, in which consists the
chief novelty Of the invention compared with other
wrg,d rotary devices. The inner cylinder Is pene-
trated by fixed shaft which shaft is bent to side
after passing through the end until it COMEDIES with
the center of the large cylinder outer To this
portion If the fixed shaft the wings connected, and
Their extreutes are thus made to travel in perfect
circle in close contact with the inside OF the outer
case. Tie inner cylinder thus gives motion to the
wiz 90 ard in every revolution liz periphery Is sid
outward and again contracted upon them. IL "a not
strictly true that the wings thrust outward and
withdrawn, although ii is relatively to the inner
cylinder The passage Of the wings through the latter
is packed in very ingenious and perfect manner to
allow for the varying ang lie which 1t continually rs
sumes ard the whole machine appears to involve out
moderate degree of cost either for construction OF
repairs. The inlet and outlet openings made, Of
course rear the point where the two cyindc surfaces
are in contact; ard the blast of wind very nearly
steady and continuous, slight huctuation Of pressure
occurring with the commencement of each wing to
cross the delivery opening. This fuctuation is due
to The reorganization back flow Of the air until the
space between the wings is compressed to the extent
REQUIRED for delivery. The air in the blower at
Hoes IL compressed to about one pound plus pressure
and the variation ruded to in the intensity OF the
blast is too slight to be any annoyance. The blower
described driven about seyentyye turns per mln-
ute, and requires only from one fifth to one quarter
the power formerly consumed in obtaining the same
effect from a very large and we-constructed fan.
About fourteen horse-powe was formerly consumed
in blowing single cupola, the amount being meas
ured by a steam-engine-indicator The jersey City
founderi,., which previously employed lower press
ure of blast have experienced SNEAKER saving OF
power, but have realized very considerable economy
Of fuel in the cupOla-the amount required per tun
for melting being twenty or thirty per cent less
than before.
HORSE BRAHEs-When the animal muscles are EN-
Iloyed overcoming resistance or in other words IN
developing power certain effects observed among
which are n quickened pulse, improved health and
spirits ard If severe or long continued exhaustion or
fatigue. This the case in ascending hill, drawing
load on a level giving motion to machinery and
generally wherever work OF any kind Is periormedi
but in descending ladder, holding back load IN dc
Seeding h there reverse action OF the muscles
kind Of absorption q porer, the effect OF whch mas
never presume, been investigated, as the phenom
enon is comparatively rare and seldom prolonged be-
yond very few minutes. Thee thoughts were sug-
gested by brief inspection of the model on which the
carriages are being constructed for the turnpike road
over the summit Of Mount Washington. They are
made to stand different anges so that the floors are
always nearly level and they provided with brakes
operated at will by the hand Of the driver or by the
backward strain of the horses The last feature seems
particularly worthy Of attention. it may prove ad
vartaeeous in general use and prevent some OF the
daily falls in Broadway, great majority OF when oc-
the stopping aud not in the starting or conthu
Gus progress Of vehicles The brakes in the model re-
frred ~ operated by strap passing around pui
ley or ring IN the forward extremity OF the pole or
tongue. At every declyty the carriage, IN GROWING
forward upon the hores tghtens the strap and orns'
the brekes in contact with the whee-. When II De-