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

driven SHAFT vsres with every new position Of The
movable wheel. lifts periphery Is allowed 10 press
against the center only Of the face-whee motion
results but when moved ever little from that posi-
tion degree Of speed is obtained which increases
with every successive removal of the wheel from the
center until at its periphery, the fastest Of ced
is attained By means of suitable lever held in the
hand Of the sawyer the rate at which the log fed up
nav be varied with every indication 10y sound or
otherwise) of changing character in the wood. The
periphery Of the driven wheel in this feed made OF
hard wood placed in such manner that the end Of the
grain is always presented 20 rub against the face
wheel. BY this Device and with close attention, Q
much larger quantity Of lumber is sawed in better
manner ard with less danger TO the machinery, than
| by the old arrangements.
PrRRY's VALVE Eorios.-Screw Propellers are
very common on our Upper Lakes, more especially
| on Lake Erie. The extent to which us form Of
steamers has become favorite may be inferred from
the fact that in four years one concern, the Shep-
pard Iron Works" of Buffalo, shop little mentioned
in the engineering literature of the country constrsct
cd for this purpose less than 100 screws, ranging
from nne to eighteen feet in diameter The engines
en- poyed in hese vessels have generally been single
hchpressure cylinders mounted perpendicuarly over
the crank but this style is giving way for the In
PRODUCTION Of the compact oscilatory An ex-
tremely simple valve-moton for this style of engine
has been lately devised by Mr. II. o. Perry, the Chief
Engineer at Sheppards, and to this fact ID probably
due great part its sudden popularity. An ose'stng
engine is hung on trunnions like cannon, and It's
rocking motion as the crank revolves seriously de-
ranges all the usual methods of working the valve.
Mr.. Perry employs a rotating or partially rotating
valve, serving its purpose in manner precisely SINH
lar the ordinary sde-valve employed on locomotives
and small stationary engines. The ports are arranged
as usual, but the cylinder-fsce, on which the valve
rests is curved instead of fat and the valve "a in short
slide bent 10 fit the cylinder-;sce. These carved
surfaces form portion of true cylinder, and the de-
sired sliding motion is obtained by partially revolving
slaf which extends along its axis IL must be under
stood that this shaft extends and not engthwse
of the main working cylinder and projects at the aide
! rather than at the end OF the steamchest On the
projecting portion of this shaft is swell containing
socket in which the starting bar may be inserted for
working by hand, and also two arms extending IN
nearly opposite directions, with wrist pin at each ex-
tremiy by connecting of these wrist-pins TO any
fixed point the rocking of the cylinder gives motion
| to the valve which would be exactly the motion de-
sired except for the absence of what is technically
termed lead To obtain just the proper motion the
pin is connected by suitable rod, not TO fixed point
ic being keyed in such position to give the lead or in
other words make the valve uncover the port and ad-
Rit steam to the cylinder little before the commence
ment of the stroke In backing the engine this rod Is
thrown out of use and the other wrispn is connected
in similar manner to another eccentric by which
means perfect reverse motion is obtained.
The great simplicity of the arrangement will at once
| be obvious A steam.chest of little more than the
ordinary hight with slight shaft protrudng through
stufng- its side couple of short arms thereon
! THAT extending upward being somewhat the longest
to compensate for the increased motion OF that point,
due TO its greater distance from the line OF the trun-
nions and two executives, with suitable excenstnc
rods aud hooks connected together, constitute the
whole of this ordr arily complex apparatus. The
ovehaneng end of the rocking shaft being Of eonsid-
cradle length an additional support usually provided,
consisting Of a suitable arm rising from the trunnon-
We consider the arrangement very considerable iu-
| provement
Several large propeller engines are now in course OF
| construction this plan, some of which are TO be
condersng low-pressure engines and provided with
every modern consrvance for economy and conve-
nience.
| GoLp's AUTOMATIC STEAM HEATING APPApArus.--
There has recently been introduced into the Irving
House in this city apparatus for warming which
little superior TO any before In use. IL
steam apparatus, the invention of Mr.. s. j. Gold OF
New Haven, and involves method Of managing
the boiler and aso of dispensing the heat to the apart
ments. In parting with its heat steam changes into
water and provision made for allowing the water TO
trchle back to the boiler from all parts Of the build
ing without difficulty
| We will describe each portion separately and brst
the automatic selfregulatng boiler The ash-pk rs
closed by tght.ftting door, and all the air allowed
to enter is drawn in through tin pipe some four or
five inches in diameter. This pipe Is crooked IL hrst
leads up nearly to the ceiling, next descends nearly 70
the same level that Of the water within the boiler,
and then ascends again, leaving the end open.
A connection is made by small pipe from the
| lower bend to a point in tho boiler somewhat
below the proper water level, and the moment
| the pressure Of the steam becomes sufficient
to force the water up and fill the bend Of the srppc
the draught Is entirely stopped As usually operated,
the bend is partially filed and every auctuaton Of
pressure ia followed by change in the draught which
by checking increasing the fire restores TO is
proper condition. Water may be poured at any time
| in the open end and il immediately passes through
the small pipe into the boiler. The coal supplied TO
the furnace in the usual about two or three
times day and if by any possible carelessness such
az leaving the ash pit opcn too much steam gener-
ated the only effect will be to throw out at the open
end Of the ar-ppe first quantity Of water, and then
all the steam which s generated. We consider this
arrangement by far the most philosophical, cheap and
efficient which we have ever met with. tf,.r
The steam thus uniformly maintained at shs very
moderate pressure Of one-half pound or isss per
square inch above that Of the atmosphere conveyed
H. -. A