New-York tribune., 1873-07-26

CCCCis tbe cylinder; PPP the piston, and the
valve The piston is of such length that through the
whole of its movement some part OF the funneshaped
opennr in the piston shown between - shall be op
pose the exhaust pipe L. The valve has also longi
tudinal aperture Shown as extending at each side Of
S. which in tho same way. Is always opened TO the
steam pipe the position OF which shown by the dotted
circle s. The diagram shows the engine with pressure
on at the steam end Of the cylinder in which position
the unnelshaped opening communicates with the semi
circular one opposite il in the piston through
the curved tubular opening into tho eek
baust " end of the cynler, allowing the
steam from that end 20 pass of by Z. When tho ps-
ton mas reached the end Of It's movement the steam
passes through little passage cut In the inside OF the
cynder al "a from az which is in communication with
the valye-opcning, and entering at the end OF
the valve through Al, which will thus be op-
posite tho little space between the valve ana
the piston head. This throws tho valve into
the reverse position in the piston. and the steam now
enters by the opposite gallery Of the valve into the tubu
lar curved passage communicating with the "eXhausV
end OF the cylinder aud az the same moment closes tue
steam" end the steam passage aud opens IL 10 inc
exhaust In this way there can be no stopping on
center because is possibility OF shutting OIL the
steam at one end without simultaneously letting 1t on at
the oher and let the engine move as slowly as may be
il will never stop while there is any steam pressure
The amount of steam is regulated by hand valve and
the work being constant no regulator s needed.
There l. q stone dressing macnne on Tue pTIuclpe ol
the iron-planers but as it not in operation and
showed none OF its work. It is impossible 20 Judge OF its
efficiency II is sent by the Patent Machine Stone
Dressing Company Near Il is the Victoria printingma
chine very compact machine ITO do what is claimed
for IT, but II is not at work. and only judge from
common report A rotary pulp-fter for paper-making
seems very likely to be efficient, and very easy to Keep
clean and in operation. 1t is foursided prsm each
side of which is metallic 1terngpate, aud which Is
kent revolving in tank Of paper pulp, the pulp being
drawn into the prism by suction pump and discharged
below 1t has the double advantage Of agtatng the
min in the tank by its motion and keeping 1t
always OF the same consistency IN the filter.
and OF leaving all the particles too large to pass
an the outside where they can be removed most
readily There is also a miniature model OF paper
making machine in operation sent by B. Donkin Co..
London made to scale of One-eighth and driven by
small turbine Wheel which is to the general spectator
interesting not only piece of excellent mechanical
construction but as explaining the whole operation OF
papermaking after leaving the pupng machine until
tho naper is on the rollers lathmaklng machine ls
worthy OF note as aborsavng, though 1t has the fault
NJ reouyng the better qualities of lumber for its USE
og NJ the length OF the ah placed in the machine on
centers AZ in turning lathe and long knife operates
an II AZ r the yeneercutting machine cutting contn
uous shaving OF full length and the thickness required OF
the lath This is followed by roller set with Qngtud-
a and parallel knives the length OF the ath ana set at
mol, nee apart as the width OF the lath requires,
the shaving comes of from the og 1t passes under
the roller which Sits the laths and passes them op'