Improvements in and relating to Steam Boilers.
Year: 1892

page_text: Date of Application, 26th July, 1892-Accepted, 8th Oct., 1892
COMPLETE SPECIFICATION.
Improvements in and relating to Steam Boilers.
I, LEWIS WOODARD LESTER, a Citizen of the United States of America,
residing at Glencoe, in the County of McLeod, and State of Minnesota, one of the
United States of America, Gentleman, do hereby declare the nature of this inven-
tion 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 relation to certain new and useful improvements in steam
boilers, especially adapted as locomotive boilers, and it consists in the novel
construction and combination of parts, as hereinafter specified.
In the accompanying drawings,
Figure 1 represents a longitudinal vertical section, and
Figure 2 represents a vertical cross section.
In the accompanying drawings, the letter A designates the fire box, located
under the front portion of the boiler B. Leading from the fire box along the
boiler is the external flue C, opening at its rear end into a smoke or combustion
chamber D, at the lower rear portion of the boiler, the top wall of which is formed by
the crown sheet D', and the front wall by a half flue sheet E, carrying the, lower
internal flues a, opening into said chamber.
At their front ends, these flues open into a smoke or combustion chamber F.
Leading from the upper portion of this chamber are the flues ; in the upper half
of the front flue sheet. At their rear ends, these flues open into a smoke box G, which
extends across the entire rear of the boiler. Under the lower portion of the
chamber F is the water space f, which forms a part of the water room of the
boiler.
In said chamber, and secured to the front wall of the boiler is the mud and water
drum H, into the lower portion of which leads the feed water pipe g. Communicating
with the central portion of said drum is the pipe g', leading to and discharging at
the centre of the boiler.
I is the steam room and I the dome, which are located at the front portion of
the boiler. K is a water chamber or jacket entirely surrounding the fire box, and
the flue C, and communicating with a water space K', between the lower portion
of the rear flue sheet k, in the upper half of which are the flues b, and the rear wall
of the chamber D.
Passages k¹ are also provided from the waist of the boiler into said jacket, so that
a free circulation of water is maintained through the whole. This jacket serves to
protect all parts which are exposed to great heat, and also serves to retain the heat
which would otherwise escape by radiation from the external flue, fire box, and the
lower boiler surface.
The gases of combustion passing from the fire box through the flue C, not only
come in contact with the boiler surface, but with the water jacket, passing to the
chamber D, where still further combustion takes place, thence through the flues u
to chamber F, thence into the Hues to the smoke box G, and to the smoke
stack G thus passing twice through the waist of the boiler, and once externally
thereof, utilizing a maximum per cent. of the total heat.
The feed water entering the drum H, loses a large part of its sediment, becoming
beated by the gases in chamber F, which have free circulation on three sides
thereof, and discharging at the mouth of the pipe g' in a considerably heated state,
thus effecting a saving of fuel.
The upper flues of the series of flues b, passing through the steam room, serve to
dry and superheat the steam. M is a door to the smoke box or chamber D and
Mi the doorway to the fire haz

page_text: The various parts are made secure by stay bolts and longitudinal stay bars may
be employed wherever necessary. The smoke and combustion chambers, as well as
the mud drum and water jacket, are provided with hand holes, and mud plugs to
facilitate their cleansing.
$2
It will be observed that the terms "front" and "rear as bereinbefore used, are
employed in the manner customary in speaking of boilers and furnaces, wherever
the end having the furnace door is termed the "front" end, and the opposite
end, the "
? end.
rear
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. In a steam boiler, the combustion chambers D and F, located at the respective
end portions of the boiler, the former being partially inclosed thereby, the external
flue C, leading to the chamber D, and the internal flues a and b, and a smoke
box G extending along the entire rear of the boiler, and into which lead the upper
flues, the parts being so arranged that the gases of combustion are caused to pass
first from the fire box, externally of the boiler to the chamber D, thence through
the flues a to the chamber F, and thence through the flues to the smoke box G,
substantially as specified.
2. A. steam boiler, having a combustion chamber F at its front portion, and
communicating with the upper and lower flues, and a mud and heating drum for
the feed water within said chamber, and secured to the front wall thereof, whereby
it is subjected on three sides thereof to the gases in said chamber, substantially as
specified.
3. A boiler having a combustion chamber at its lower rear portion, into which
open the lower flues, a smoke box G extending across the entire rear of the boiler,
and separated from the chamber D at its lower portion by a water chamber forming a
part of the water jacket, an external flue leading from the fire box to the chamber D,
a second smoke or combustion chamber at the front into which open both the
upper and lower flues, and a mud and heating drum for the feed water in said
chamber, and secured to the front wall thereof, substantially as specified.
Dated this 26th day of July 1892.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.