IMPROVEMENTS IN COMPOUND FUNNELS FOR THE ECONOMICAL UTILIZATION OF HEAT
Year: 1882

page_text: LETTERS PATENT to Fountain Livet 8 Ledbury Road Notting Hill in the
County of Middlesex Engineer for an invention of IMPROVEMENTS IN
COMPOUND FUNNELS FOR THE ECONOMICAL UTILIZATION OF HEAT
(Void by reason of the Patentee having neglected to file a Specification in
pursuance of the conditions of the Letters Patent.)
PROVISIONAL SPECIFICATION left by the said Fountain Livet at the
Office of the Commissioners of Patents on the 16th May 1882.
FOUNTAIN LIVET 8 Ledbury Road Notting Hill in the county of Middlesex
Engineer IMPROVEMENTS
UTILIZATION OF HEAT
IN COMPOUND FUNNELS FOR THE ECONOMICAL
My invention relates to an improved metal pipe or funnel so peculiarly con-
structed and combined as to impart a rotary action to the gases in course of
evolution from the furnace below in order to retard their velocity proportionately
towards the exit of the funnel or stack and consequently allow more time for the
combination of carbon and oxygen in the furnace than with ordinary plain funnels
or stacks thus realising a great saving in fuel owing to a greater percentage of,
carbonic acid gas being obtained.
For the purpose of my invention I take a metal pipe or funnel (of thin gauge)
parallel throughout the length. Upon the said pipe or funnel I construct what I
may term the thread of a screw which I commence by a slight indentation at the
lower part of the pipe or funnel at a distance of about one diameter from its lower
end. The said screw thread protrudes inside the said pipe or funnel increasing in
size gradually upwards in uniform proportions so as at the top to project about one
eighth of the diameter of the pipe or funnel the pitch of the said screw thread
being about five diameters of the said pipe or funnel This screw thread is made
in a special form consisting of two faces that is to say one face (the shorter of the
two) pointing towards the centre of the metal pipe or funnel (but not parallel to a
D...911

page_text: line drawn through the centre) and forming an angle with the other face which
on the other hand is three times the length of the shorter face and is made with a
curve the centre of which is within the pipe or funnel. This latter face joins the
circumference of the said pipe or funnel to the internal edge or angle of the other
face.
Further in the shorter of the two faces close to the internal angle, apertures are
cut leaving only intervals sufficient to maintain the rigidity of the pipe or funnel
and having (at the bottom of the screw thread) a width not greater than one
sixteenth of an inch and increasing upwards gradually but so that the whole area
of such apertures shall not be in the aggregate more than seven per cent of the
area of the clear space of the metal pipe or funnel, measured at the top of the
screw thread. Such apertures are made by cutting the metal through on three
sides only of the intended aperture and bending the metal outwards (at the point
where it would otherwise have been cut through to form the fourth side of the
aperture) into the interior of the pipe or funnel so as to form a prolongation of
the other face and to deflect the current of air passing into the pipe or funnel
through the aperture in a direction more or less parallel to the side of the pipe or
funnel.
1 construct the said screw thread by hammering the same on a block or mandril
cast hollow in metal or other suitable material having a tapering groove in it
which corresponds to the screw thread as above described. In the side of this
groove corresponding to the shorter of the two faces of the screw thread I construct
a square continuous inner groove half an inch wide and deep having one side
continuous with the other side of the larger groove for the purpose of enabling
the metal to be turned or bent outwards into such inner groove
described.
as above
I construct one or more screw threads according to the size of the pipe or
funnel.
The said pipe or funnel is covered by a jacket of any suitable material such as
metal or brick or any other non-combustible composition closing at the top upon
the said pipe or funnel and placed at any suitable distance from the same but
having openings at the bottom proportioned to the size of the pipe or funnel and
to the number of the screw threads, and deflected away from all hot surfaces for
the purpose of admitting cold air so that it may be gradually heated by the
radiation of the said pipe or funnel and thus naturally forced through the grooves
or apertures of the screw threads into the interior of the said pipe or funnel.
Thus through the physical action of the expanding atmospheric air introduced at
high temperature into the flue the natural rolling motion of the gases in course
of evolution from the furnace is retarded and at the same time converted into a
more or less horizontal rotatory motion for effecting the purpose above set forth.
The sectional area of the said pipe or funnel should be taken at the com-
mencement of the screw thread at the bottom and should be equal to the area
of the clear air space of the furnace or furnaces to which the compound funnel is
to be applied.
The upper part of the funnel or stack should in all cases be wider in diameter
than the metal pipe or funnel above described which is preferably placed inside
the other and the space between the two being closed in at both top and bottom
by angle irons or otherwise the outer stack or funnel forms the jacket in which
openings can be made for the admission of cold air as above described