Heating and Ventilating Engineer.
Year: 1887

page_text: Date of Application, 17th Mar., 1887
Complete Left, 30th Nov., 1887
Complete Accepted, 30th Dec., 1887
A communication from abroad by ISAAC DAVID SMEAD, of Toledo, County of Lucas,
State of Ohio, United States of America, Heating and Ventilating Engineer.
1, WILLIAM PHILLI'S THOMPSON F.C.S., M.I.M.E. of the Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool, in the County of Lancaster, and
323 High Holborn, in the County of Middlesex, Civil Engineer, do hereby declare
the nature of this invention to be as follows:-
This invention has for its object a series of improvements in the air heater described
in my provisional specification No. 18117 a communication from the same inventor.
The principal points of the invention consist in dividing the body in rear of the
grate into two separate combustion or heat chambers, the air passing up the central
space between them, thus giving more heating surface.
At the rear end of these is secured a breeching or box which, rises above the body
to connect with a large return flue, one on each side, these connecting at their front
ends with a front breeching or chamber above the door, and from this front chamber
midway between the return flues, extends the horizontal smoke pipe.
The return flues are made corrugated, narrow and deep, first to secure as much or
more heating surface as was furnished by the 12 round tubes formerly used, and
second to cause all the fine ash and soot to accumulate in the narrow space at the
bottom of these flues, and thus obstruct the radiation of heat to the least extent
possible.
In a round tube the ashes and soot accumulate on about nearly half the surface, thus
reducing greatly, the radiation of heat. By making these flues with vertical walls.
the ashes and soot drop down to the lower edge, thus leaving nearly the entire surface
free to radiate heat.
The object of locating the smoke pipe down between these return flues which
preferably arch towards it above, is to reduce the height of the furnace as a whole, so
as to leave more space for a warm air chamber above the furnace, as the larger the
volume of air, the more regularly it flows through the heat flues; and in some cases
[Price 8d.1

page_text: buildings have very low basements, in which case they found difficulty in getting the
old style furnaces in.
The direct draught in this is thrown back from the front plate, so as not to radiate
heat in the basement, it being connected with the smoke pipe by a short round tube
or collar, and is closed by a sliding damper or valve curved to fit the semicircular
top of the opening leading into the smoke pipe, it being operated by a rod projecting
at the front.
Directly opposite the smoke pipe is a rotary valve, (same as in the old arrangement)
to admit cold air when it is desired to check the fire.
The door instead of being hinged to the face plate as formerly, is hinged to a
separate frame, which has a rim projecting inward far enough to cover the joint all
around between the front plate, and the front part of the fire box, all joints being
filled with stove cement, and then bolted together with heavy bolts.
in the lower part of the door frame is a roller to aid in putting in large lumps of
coal, fire-grates, et cetera.
The fire-box is lined with corrugated cast iron plates set inclined to admit air to
pass up behind them and be heated, and then enter through the row of slots to mingle
with the gas from the coal, and thus consume the smoke, which they de very
effectually. They generally have a perforated plate secured to the inside of the door
with a space between, so that the air which enters there is heated by the plate, and
then enters in small streams through the perforations, and is thus more thoroughly
distributed and mingled with the gases and smoke over the bed of coal,-there
being a slide damper to regulate its admission-the same as in the door of the ash pit
below. The general principle is the same as the former furnace.
1307
WM. P. THOMPSON & Co.,
Agents for the Applicant.

page_text: A communication from abroad by ISAAC DAVID SMEAD, of Toledo. County of Lucas,
State of Ohio, United States of America, Heating and Ventilating Engineer.
1. WILLIAM PHILLIPS THOMPSON, F.C.S. M.L.M.E. of the Agency for Foreign
Patent Solicitors of 6, Lord Street. Liverpool, in the County of Lancaster and
323 High Holborn in the County of Middlesex, Civil Engineer, do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :—
This invention has for its object a series of improvements on the air heater described
in my provisional specification No. 181187 a communication from the same inventor.
The invention is very clearly illustrated in the accompanying drawings, in which
Figure 1 is a side elevation, with front half in vertical section.
Figure 2 a longitudinal transverse section on the line of Figure 3.
Figure 3 a transverse vertical section on line - of Figure 2, looking from front
towards rear.
Figure 4a similar view on line y-y of Figure 2.
Figure 5 front elevation.
In these, A is the ash pan; B, front; C, front fire box; D, fire-box; E. fire-box
extension F, front breeching G, back breeching; H, return flue; I, smoke pipe :
J direct draught: K, direct draught damper; L, lining: M, front lining: N. grates:
O, roller for use in introducing big pieces of coal into the fire; P, door R, separate
frame to which door P is hinged.
The principal improvements on the apparatus set forth in Specification No. 1811 of
this year are as follows:
The body in rear of the grate is divided into two separate combustion or heat
chambers E, the air passing up the central space between them, thus giving more
beating surface.
At the rear end of these is secured a breeching or box G, which as shown in
Figure 1, rises above the body D, E, to connect with a large return flue H, one on
each side, these connecting at their front ends with a front breeching or chamber F
above the door P, and from this front chamber F midway between the return
flues H, H, extends the sunoke pipe I, the relative position of these parts being shown
in Figures 3 and 4.
The return flues H are made narrow and deep, first to secure as much or more
heating surface as was furnished by the twelve round tubes formerly used, and second,
to cause all the fine ash and soot to accumulate in the narrow space at the bottom
of these flues, and thus obstruct the radiation of heat to the least extent possible.
In a round tube the ashes and soot accumulate on about one half the surface, the
lower half, thus reducing greatly, the radiation of heat. By making these flues H

page_text: with vertical walls, the ashes and soot drop down to the lower edge, thus leaving
nearly the entire surface free to radiate heat.
The object of locating the smoke pipe I down between these return flues H,
as shown in Figures 3 and 4, is to reduce the height of the furnace as a whole,
so as to leave more space for a warm air chamber above the furnace, as the larger
the volume of air, the more regularly it flows through the heat flues, and in some cases
buildings have very low basements, in which case difficulties have been found in
getting the old style furnaces in.
The direct draught in this is thrown back from the front plate, so as not to radiate
heat in the basement, it being connected with the smoke pipe I by a short round
tube or collar J, Figure 1, and is closed by a sliding damper or valve K curved to fit
the semicircular top of the opening leading into the smoke pipe I, it being operated
by a rod d projecting at the front.
Directly opposite the smoke pipe I is a rotary valve (same as in the old
arrangement) to admit cold air when it is desired to check the fire.
The door P instead of being binged io the face plate as formerly, is hinged to a
separate frame R, which has a rim projecting inward far enough to cover the joint
all around between the front plate and the front part of the fire-box D, all joints
being filled with stove cement, and then bolted together with heavy bolts.
In the lower part of door frame R is a roller O, to aid in putting in large lumps of
coal, firegrates, et cetera.
The fire-box is lined with corrugated cast iron plates L set inclined to admit air to
pass up behind them, and be heated, and then enter through the row of slots to
mingle with the gas from the coal, and thus consume the smoke, which they do very
effectually. They generally have a perforated plate secured to the inside of the door
with a space between, so that the air which enters there is heated by the plate, and
then enters in small streams through the perforations, and is thus more thoroughly
distributed and mingled with the gases and smoke over the hed of coal, there being a
slide damper to regulate its admission, the same as in the door of the ash pit below.
The general principle is the same as the former furnace.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
1st. The various improvements on the air heater described in specification No. 1811
of 1887, substantially as and for the purposes herein described and illustrated.
2nd. The air heating apparatus taken as a whole, substantially as described and
illustrated.
Dated this 29th day of November 1887