Improvements in Blast Apparatus for Locomotives.
Year: 1887

page_text: COMPLETE SPECIFICATION.
Improvements in Blast Apparatus for Locomotives.
I, JOHN Y. SMITH, a citizen of the United States of America, residing at Doyles-
town in the County of Bucks and State of Pennsylvania, one of the United States of
America, gentleman, 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 relates to a new and improved blast or exhaust apparatus, designed
more especially for use in connection with locomotive and other boilers for inducing,
maintaining and controlling the draft in the furnace and heating tubes.
Attempts have been made heretofore, and with various degrees of success, to improve
the construction and operative effect of the blast apparatus or that through which the
exhaust steam is applied for inducing a draft in the flues and furnace, but great
difficulty has been experienced in so constructing and applying the exhaust apparatus
that it will utilize to the full extent the power of the exhaust steam without producing
excessive back pressure on the pistons, and will create and maintain a uniform draft
through the series of tubes or flues which can be modified and regulated at will, while
the steam which acts as the propelling power will be so applied and intimately
associated with the gaseous and solid matter as to effectually extinguish sparks carried
through from the furnace.
Among the numerous devices heretofore proposed the one most nearly approximating
without however in any respect containing my present invention comprises an annular
nozzle or blast pipe within which is located a central nozzle or steam pipe. An
annular opening or passage is formed between the central and annular blast or steam
nozzles through which opening or passage the air and gaseous products of combustion
are drawn, the inlet opening to said passage being located at or near the bottom of
the uptake and opposite the lower series of flues while the blast is directed into the
base of the smoke stack.
Practice has demonstrated that such an apparatus although an improvement, so far
at least as its effects are concerned, upon the ordinary blast pipe previously employed,
utilizes but a relatively small portion of the available power of the exhaust and is not
entirely free from objectionable features; among its other defects are deficiencies may

page_text: be mentioned its inability to produce a uniform draft through all the flues, the bottom
series being much more highly heated than those above; inability to adjust and
regulate the draft and at the same time distribute it equally through all the tubes or
flues; and want of capacity to effectually extinguish sparks.
My present invention is designed to overcome or in a great measure obviate these
defects and improve the general operation of the device, and it comprehends the
use and application of a blast or exhaust apparatus, the principal elements of which,
considered separately and in combination are (1) an annular steam nozzle or blast
pipe surrounding a central air or suction orifice and provided with an external wall or
confining passage in advance of said nozzle, the whole forming a distinct and separate
blast or exhaust device; (2) a second blast or exhaust apparatus surrounding the first
mentioned apparatus and comprising an annular steam nozzle an air or inlet passage,
and a confining chamber; (3) a confining chamber into which both of said blast
devices open and wherein the products are mingled and forced forwards; (4) inlet
passages or openings located at different points in the length of the exhaust apparatus
for taking air or gases from the uptake or chamber at different points relative to the
flues so as to distribute the draft; (5) hoods or deflecting plates for directing the air
or gases towards the inlet openings; (6) a confining chamber located in advance of
the delivery of the combined blast apparatus and made adjustable with rolation thereto
and to the opening in the smoke stack or chimney, said supplemental confining
chamber operating in conjunction with the blast apparatus to form a third or supple-
mental blast apparatus; and (7) an adjustable damper for opening and closing the
escape orifice from the uptake into the chimney or smoke stack and for regulating
the application of the third or supplemental exhaust apparatus.
My said invention also comprises certain other and additional features of construction
and combinations of parts all as hereinafter more fully described and pointed out in
the claims.
In the accompanying drawings:
Figure 1 is a vertical longitudinal section, and
Figure 2 a transverse section on the line x-x figure 1, of an exhaust or blast
apparatus embodying some of my improvements.
Figure 3 is a longitudinal vertical section through a blast apparatus embodying
certain modifications of the device as represented in figure 1.
Figure 4 is a longitudinal vertical section of another modified form of apparatus
representing the preferred construction.
Figures 5, 6 and 7 represent details of valve mechanism.
Figure 8 is a transverse sectional view through the uptake of a locomotive boiler
showing the application and arrangement of the improved blast apparatus.
Figure 9 is a partial longitudinal section of the boiler figure 8.
Similar letters of reference in the several figures indicate the same parts.
As my improvements can best be explained in their application to a locomotive
boiler I will, in the following description, refer only to the use of the apparatus in
connection with such a boiler, it being understood that the same may be employed in
connection with other forms and constructions of boilers or furnaces for producing a
forced draft therein, or in any situation where an exhaust is desired, the location and
arrangements of parts being modified to adapt the devices to the particular style of
boiler or furnace.
As applied to a locomotive boiler the exhaust apparatus is preferably located within
the uptake and beneath the opening leading to the smoke stack, the base resting upon
and communication with the exhaust chamber or the escape pipes into which steam is
delivered under pressure from the cylinders, or if may, if desired, be conveyed thereto
from the boiler or other supply.
The lower end of the apparatus, that is to say, the principal or lower induction
passage is arranged at or near the bottom of the uptake, at or about the level of the
lower series of flues.
Referring to the device illustrated in figures 1, 3 and 4, A designates the central
air passage or inlet orifice communicating through induction passages 1 with the

page_text: space surrounding the apparatus ; B the annular steam space or nozzle communicating
through passage or chamber 2 with the steam supply; the confining flue or passage
into which the blast of steam from nozzle B is delivered and acting upon and against
the column of air draws the latter through the opening A and forces it into and
through the said flue C. The parts A, B, C constitute the inner ejector or exhaust
apparatus.
Surrounding the inner ejector and extending beyond the mouth of its confining
flue C is a confining flue or passage F into which the air and steam issuing from said
inner ejector is delivered, and between the said confining flue C and the rear extension
of flue F is located or arranged the second or outer ejector embracing air passage or
inlet D and an annular steam passage or nozzle E, the said second ejector also
delivering into the confining tube or passage F so that the products of both ejectors
are delivered into this confining flue F whose exit opening is within or adjacent to a
third confining chamber G between which latter and the flue F an opening or space
is formed constituting an air inlet H through which air is drawn and forced through
the flue G into the chimney or smoke stack.
The air passage D of the outer ejector communicates through inlet passages 3
with the exterior of the apparatus at a point above the inlet 1 of the inner ejector,
and a series of inlet passages 3 (see figure 1) may be formed at different levels and
all communicating with the air passage D below the steam nozzle E, to draw air from
different portions of the uptake or chamber thereby equalizing or distributing the
draft in the flues.
From an inspection of the drawings and a consideration of the mutual and
cooperative relation of the several parts, it will be obvious to one skilled in the art
that when steam under pressure is admitted and caused to flow through the nozzles B
and E, the jets issuing from said nozzles will operate to draw the air and gases
through passages A and D. The air drawn through passage A as it is forced into
flue is surrounded by and intimately mingled with the steam issuing from nozzle B,
and the air drawn from passage D is mingled with steam from nozzle E while the
products air gas and steam-of the two ejectors are mingled together in the
passage F whereby not only is a more powerful action secured but the steam is
distributed throughout the entire column and brought into contact with whatever solid
matter is drawn through with the hot air and gases.
It is of course understood that in referring to the action of the apparatus, whore
air is mentioned it is intended to include and comprehend not alone air but all the
gaseous products of combustion as well as solid particles which flow or are drawn
through the flues.
The separate streams of air and steam issuing from nozzles D, E may either be
combined in a separate confining flue H (figures 3 and 4) and afterwards united in
flue F with the steam and air issuing from flue C of the inner ejector, or they may be
injected directly into flue F (see figure 1) and there caused to mingle and combine
with the steam and air issuing from flue C, and when desired either ejector can be
shut off by closing the inlet ports to the steam nozzles, as hereinafter described,
so that one or both ejectors can be put in operation as circumstances render
desirable.
Moreover by providing a number of air inlets 3 at different levels and supplying
suitable dampers or valves 4 controlling said inlet openings, air can be drawn
from different levels and the draft through the flues can thus be equalized and
adjusted.
The adjustment and regulation of the draft may be still further controlled by the
application and arrangement of deflecting plates or hoods I on the exterior of the
apparatus and in such relation to the inlet openings as to deflect the air towards said
openings. These hoods or deflecting plates I, are preferably made adjustable and
reversible so that they can be shifted to different positions relatively to the inlet
openings.
Having thus briefly outlined the principal elements of my improved blast or

page_text: exhaust apparatus I will now proceed to describe certain specific forms in which
these principals have been embodied.
Referring particularly to the apparatus illustrated in figures 1 and 2, it will be seen
that the tube containing the central air passage A of the inner ejector is mounted
upon four radial arms 10 attached to or formed integral with the hollow base or
steam supply chamber 11, the induction passage 1 being contained in said arms 10
while the base 11 rests upon and communicates with the interior of the chamber into
which exhaust steam is delivered from the cylinders.
The confining flue C is constructed in the form of a tube, enlarged near its lower
end to form a steam space 2 and provided with a flange or collar 12 fitted to the
upper face of the base 11. The inner walls of the flue C converge at opposite ends
towards a point about midway between the air pipe A and the upper end of flue C, at
which point the opening is about equal to or slightly exceeds the area of the air
passage A. The annular steam nozzle B is formed between the flue C and exterior of
air tube A, and the steam chamber or passage 2 leading to said nozzle communicates
through an annular or other shaped port or ports 13 with the interior of base 11.
The air passage D of the outer ejector is formed between the outer surface of flue C
and a tube 14, while the outer annular steam nozzle E is formed between the upper
end of said tube 14 and the external wall or casing 15.
The air inlet passages 3 extend through the casing 15 and tube 14 and open intc
the chamber or passage formed between tube 14 and flue C, while the space or chamber
formed between the casing 15 and tube 14 communicates through ports or passages 16
with the interior of base 11.
Upon the exterior of the upper end of tube 14 is mounted a ring 17 whose inclined
or beveled outer face cooperates with the contracted mouth or casing 15 to form the
steam nozzle E, said ring 17 being made vertically adjustable in order that the size of
the annular nozzle may be increased or diminished when desired. For convenience
of manufacture the tubes 14 and 15 may be cast or otherwise formed in sections as
shown, said sections being secured together and to base 11 in any well known
manner.
Beneath the ports or openings 13, 16 through which steam is admitted to the
chambers or passages communicating with nozzles B and E respectively, annular
valves 18, 19 are arranged and mounted upon links 20, whereby as said valves or
either of them is given a partial rotation they will at the same time be moved towards
or away from the steam ports 13, 16 to close or open the latter and thereby start or
stop either or both ejectors.
As it is seldom if ever required that both ejectors should be entirely thrown out of
operation, and as it is sometimes desirable to close the one and open the other I
provide a shaft 21 with arms 22 engaging the valves on opposite sides of the center
of said shaft and extend the latter out through the walls of the ejector so that when
said shaft is oscillated it will move one valve in a direction to cause it to rise against
its seat and at the same time will lower the other valve.
The apparatus illustrated in figure 3 represents a slight modification in the form
and construction of the ejector.
The air inlet A and confining tube C of the inner ejector are substantially the same
as in the previous illustration, but are shortened so as to dispense with the steam
chamber or passage 2 and bring the steam nozzle B nearer and in direct communica-
tion with the steain space or chamber in base 11.
A single transverse induction passage 1 is formed at the base of air passage or
tube A, said induction passage extending entirely across the base 11 so that it can be
cleaned from either end, while the lower edge of the tubular cross piece containing
said induction passage rests upon and cooperates with the bridge or division plate in
the exhaust chamber (see figure 8) for the purpose of directing the exhaust steam
from each cylinder into the base 11 and thereby, in a measure, reducing back pressure
in the opposite cylinder.
The tube 14 is also shortened to bring the air inlet D and nozzle E of the outer

page_text: ejector below the upper or exit end of confining flue C, whereby a confining flue H is
formed between said flue C and the outer casing 15.
Both ejectors are thus provided with a separate confining chamber and the blast
issuing therefrom may either be delivered into the smoke stack, or, preferably, into
the confining chamber or flue F common to both ejectors.
The base of the tube 14 is enlarged and provided with two series of ports or
passages, the one 30 for establishing communication between the interior of base 11
and the steam space or passage leading to nozzle E and the other 3 leading from the
exterior to the space or air chamber between tube 14 and flue C. As in the apparatus
shown in figure 1 the outer wall or casing 15 is constructed at a point slightly below
the end of tube 14 so as to form a larger space or chamber for steam in its passage
to the contracted nozzle E.
The deflecting hoods or plates I as arranged in this instance are so disposed that
the one at the bottom will limit the action of the inner ejector to the base or bottom
portion of the uptake while the outer ejector draws air from the upper portion of the
uptake or chamber.
A single valve 19 is employed in this instance, arranged to close the steam ports or
passages leading to the outer ejector. The annular valve is connected by ball and
socket joints to a series of links 31, the latter being mounted in projections or studs 32
in a manner to permit them to vibrate thereon so that when the valve is rotated, as by
means of a crank 33 secured to one of the studs 32, it will be caused to approach or
recede from its seat.
The preferred form and construction is however illustrated in figure 4. The base 11,
induction tube A, nozzle B and confining flue Care not materially different from the
corresponding parts of figure 3, but the relative position of nozzle E and air inlet D
is reversed the former being located at or near the upper end of tube 14 next to
flue C, while the air inlet D is between the tube 14 and outer wall or casing 15
surrounding the said nozzle E.
One of the principal advantages secured by this change in the arrangement of the
air and steam nozzles is the removal of obstruction to the free passage of steam to the
nozzle E. The tube 14 which, in conjunction with the outer casing 15 and flue C.
divides the space between the two last named and forms the air and steam passages
leading to inlet D and nozzle E, is enlarged or tapered at the base and provided with
a flange fitted and secured to the base 11, and the outer casing 15 is provided with
one or more series of inlet openings 3. The chamber or passage between tube 14 and
flue C leading to the nozzle E is free from obstructions and opens directly into base 11
and in like manner the air space or passage between tube 14 and casing 15 leading to
inlet D is unobstructed and open through ports 3 with the space surrounding the
apparatus.
An annular valve 19 is arranged to close the port or ports leading to the nozzle E
but instead of being mounted upon links as herein before described it is mounted upon
cams or toothed eccentrics 40 to which the valve is connected by links 41 so that
when one or more of said cains is oscillated, the valve will be caused to reciprocate
both laterally and vertically and will be brought against its seat with a rubbing action
or movement. This feature which is common to the other valve operating mechanisms
hereinbefore described is of considerable practical value and importance as by the
combined lateral and vertical motion of the valve the latter as well as its seat are kept
clear by the rubbing action of the one upon the other.
As is well known to those skilled in the art great difficulty is experienced in
keeping the valves clean so as to prevent sticking, and especially is this the case
where, as in the present instance the valves are subjected to the action of steam
charged with oil.
By the action of heat the oil supplied to the cylinders is partially decomposed and
the product carried over by the exhaust steam is deposited upon the valve and its
seat forming a thick obstructing coating which not only interferes with the proper
working of the valve by its mere presence but forms an active corroding agent which

page_text: attacks the metal destroying the valve surfaces, besides adding to the material of the
interfering coating, the products of the corrosive action on the metal.
This has heretofore been regarded such a serious defect as to lead engineers to
discard and object to the employment of blast or exhaust apparatus wherein valves
alone were employed or depended upon to adjust and regulate the draft. By the use
of the compound or spirally movable valve which slides into contact with its valve
seat but is entirely removed therefrom when the steam ports are open, some of these
objections are overcome or avoided, but not such as are due entirely to the corrosive
action of the oil.
To obviate this defect and increase the durability or life of the valve I construct
the wearing or contact surfaces of glass, asbestos or other siliceous material which
may be accomplished by the insertion of said material within a groove or casing as
shown in figures 4 and 6 at c. The wearing surfaces of the valve are the parts most
exposed to the action of the steam and oil, hence by making them of a material which
is proof against corrosion, and giving to the movable section a compound movement
as described, the valve is kept and maintained at all times in condition for adjustment
and can be employed in situations and under circumstances such as would render
sliding valves with metal surfaces practically inoperative and usoless after a short
exposure to the action of the exhaust steam.
Having now described and explained the general features of my improvements, and
illustrated some of the numerous forms in which the same may be embodied, I will
now proceed to describe the preferred mode and mechanism for applying the blast or
exhaust apparatus to a locomotive boiler for cooperating with the smoke stack.
Referring to figures 8 and 9 wherein a portion of a locomotive boiler is illustrated
(it being understood that any approved form or construction may be employed)
K represents the division wall located within the chamber into which exhaust steam
is delivered from the cylinders on either side of said wall, K' the smoke stack, K² the
uptake or chamber into which the flues open, and K³ an exhaust or blast apparatus
such for example as hereinbefore described, the particular apparatus shown repre-
senting the preferred construction as illustrated in figure 4. The base of the blast
apparatus rests upon the open end of the exhaust chamber or passage the transverse
flue containing induction passage 1 resting above or upon the upper edge of the
division wall K so that steam from each cylinder will be conducted directly into
base 11 instead of the chamber or passage communicating with the opposite cylinder.
Between the upper or eduction end of the blast apparatus and the opening in the
smoke stack a hood or confining flue L is arranged. The flue L is of somewhat
larger internal diameter than the upper end of the blast apparatus and is held
separated therefrom to form an annular or other shaped passage, and its lower end is
formed or provided with a flaring mouth or deflecting plate while its upper end is
adapted to fit within or otherwise engage and close the lower end or passage leading
to the smoke stack. The flue is mounted in such manner as to permit of a vertical
movement so that when lowered it will uncover the entrance to the smoke stack and
permit the heated products of combustion to pass from the uptake directly into the
smoke stack when impelled either by a forced or natural draft or both combined, but
when the said flue L is elevated it will cut off or close said entrance to the smoko
stack and compell the gases and products of combustion to pass through the blast
apparatus or some portion thereof before entering the smoke stack.
As shown in the drawings provision is made for such adjustments by means of eyes
or guides secured to the flue and working on vertical rods or guides 12, and in order
that the adjustment may be made by the engineer, a bell crank or other equivalent
lever is arranged to engage said flue and is connected to a rod extended back to
the cab and provided with suitable retaining devices, whereby when said rod is
reciprocated the flue will be elevated into engagement with the inlet to the smoke
stack or lowered to open said inlet.
As before stated an annular or other shaped opening is formed between the exterior
of the blast apparatus K³ and the movable flue L through which air is drawn by the

page_text: action of the blast within said flue, the latter constituting a confining chamber for
.receiving the gas or air and steam drawn and forced through the blast apparatus K³
as hereinbefore described. While this supplemental air passage is desirable as
providing an additional draft inducing device it is not essential to the complete
operation in other respects as will presently appear.
The vertically movable flue L constitutes in effect a damper or valve for directing
the products of combustion or a portion thereof into the chimney or smoke stack
either partially or wholly through the exhaust or blast apparatus, and its special
application or use is to secure a regular and even draft and prevent back pressure in
the smoke stack or uptake.
The blast or exhaust apparatus as usually constructed and applied to locomotives
operates in a manner to force or propel the air and gases into and through the smoke
stack, that is to say, the steam operates upon the air or gases in advance of the jet
opening, only a portion if any of the latter being drawn through the ojector proper.
The steam supplied to the exhaust apparatus being the waste steam from the
cylinders is not delivered under a uniform or constant pressure but intermittingly
hence the draft is produced and maintained by a series of successive impulses.
Each impulse is of short duration and the blast of steam is driven against and
through the air and gases at the top of the uptake and in the smoke stack, the result
is that after each blast a reaction takes place, that is to say, as the temperature of
the steam falls and as it escapes from the smoke stack the forward movement of
the air within the furnace and boiler is partially arrested and in some instances a
reversed or downward movement of air takes place in the smoke stack, which not only
arrests the draft but diminishes the effective work or the next succeeding blast
besides lowering the temperature of the air and gases in the uptake and smoke stack.
It is for the purpose of obviating or in a measure overcoming this defective action
that introduce the cut off flue L, for, by enlarging the effective capacity of the
exhaust apparatus and applying said flue between it and the entrance to the smoke
stack, all the products of combustion are compelled to pass through and be acted
upon directly by the blast apparatus so that should there be any backward movement
it would be checked by the next succeeding blast before reaching the uptake or flues,
hence a more regular and uniform draft will be maintained.
Moreover by making the said flue L adjustable as described, the power of the blast
apparatus can in a measure be adjusted and controlled and when, as in starting up the
fire, or when the engine is not in motion or for other reasons it becomes necessary or
desirable to do so, the flue L can be dropped or noved down upon the blast or
exhaust apparatus K³ thereby establishing a clear passage from the uptake into the
smoke stack, or said passage may be more or less opened or uncovered as desired by
properly adjusting the position of the flue L.
Referring to the steam nozzles B and E it will be observed that in order to produce
the maximum effect of the steam on the adjacent columns of air or gas the passages
leading to and in fact constituting the nozzles through which the steam is injected are
so formed that the contiguous walls or surfaces shall be brought nearest together at a
point below the ends of the passage and diverge slightly but uniformly to the end. By
thus contracting the steam passage below the mouth of the air passages the steam is
slightly retarded and compressed and emerging from the narrow opening is conducted
between the gradually diverging surfaces to the mouth where, by its expansion and
pressure, it acts upon the enclosed column of air to carry and force the latter through
the flue or passage and into the smoke stack.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, 1 declare that what
I claim is:
1. The combination, in an apparatus such as described, of the inner and outer
ejectors and the confining flues therefor; substantially as described.
2. In combination with a central air passage, annular steam nozzle and confining
Hue, constituting the inner ejector, a second ejector surrounding the said inner ejector

page_text: and provided with an air passage, a steam nozzle and a confining flue; substantially
as described.
3. In an apparatus, such as described, the combination of an inner ejector and an
outer ejector, a confining flue for the inner ejector and a confining flue common to
both ejectors; substantially as described.
4. In an exhaust apparatus, such as described, an inner ejector provided with air
and steam passages or nozzles and a confining flue, a second ejector surrounding the
first mentioned ejector and provided with an independent air supply, steam nozzle and
confining tube, and a confining tube or flue common to both of said inner and outer
ejectors, the several parts being combined for conjoint action; substantially as
described.
5. In an exhaust apparatus such as described, an inner ejector having a central air
passage an annular steam nozzle surrounding said air passage, and a confining flue,
an outer ejector surrounding said first mentioned ejector and provided with an
annular air passage, an annular steam nozzle and an independent confining chamber
whose inner wall is formed by the exterior of the confining flue of the inner ejector,
the several parts being combined as described.
6. In an exhaust apparatus for boilers such as described, the combination with the
flues and the uptake or chamber of a blast apparatus of the character indicated having
a series of inlet passages arranged at different levels with respect to said uptake or
surrounding chamber; substantially as described.
7. In an exhaust apparatus for boilers and in combination with the series of flues
or draft pipes and a chamber into which said flues open, an exhaust apparatus having
an inner and outer ejector, the one provided with air inlet openings near the lower
portion of said chamber and the other with air inlet openings at a higher level;
substantially as described.
8. In boilers such as described and in combination with a series of flues or draft
pipes and a chamber or uptake into which they open, an exhaust apparatus such as
indicated located within said chamber and provided with two or more series of inlet
openings at different points in its length and valves controlling said openings;
substantially as described.
9. In combination with a series of flues or draft pipes and a chamber or uptake into
which they open, an exhaust apparatus such as described, comprising an inner ejector
having air inlet at or near the base and an outer ejector whose air inlets are located
at a higher point in the chamber and deflecting plates or hoods for distributing the
draft; substantially as described.
10. In an exhaust apparatus such as described, the combination of the hollow base
and central air tube, the flue supported upon and secured to said base its lower end
surrounding the air tube to form an annular steam nozzle communicating with the
interior of the base; substantially as described.
11. In an exhaust apparatus such as described, the combination with the hollow
base and central air tube supported upon hollow radial arms, the flue surrounding
said air tube and forming in connection therewith an annular steam nozzle, ports or
passages connecting said nozzle and the steam chamber in the base and a valve
controlling said ports; substantially as described.
12. In an exhaust apparatus such as described containing an outer steam nozzle, an
inner steam nozzle and separate air passages adjacent said nozzles, and in combination
therewith and a steam chamber common to both nozzles, a separate valve controlling
steam ports or passages leading to each of said nozzles; substantially as described.
13. In a locomotive and other similar boilers, the combination with the uptake or
chamber and the passage lead ingto the smoke stack or chimney, an exhaust apparatus,
and a movable flue interposed between said exhaust apparatus and the entrance to the
smoke stack for opening a direct passage from the uptake into the smoke stack or
directing the products of combustion through the exhaust apparatus, as described.
14. In combination with the uptake or chamber and the smoke stack of a boiler,
an exhaust apparatus located in said uptake or chamber and an adjustable flue
surrounding the delivery end of the exhaust apparatus and cooperating with the

page_text: smoke stack to close or open direct communication with the uptake or chamber
substantially as described.
;
15. In an exhaust apparatus such as described and in combination with the ports
through which steam is admitted to the nozzles, a valve provided with a silicious
packing or surface, as and for the purpose set forth.
16. In an exhaust, apparatus such as described, and in combination with the ports
through which steam is conducted to the nozzle, a valve and devices for moving
the said valve laterally as well as towards and from its seat substantially as and for
the purpose set forth.
17. In an exhaust apparatus such as described provided with a steam nozzle to
which exhaust steam is conveyed through ports or openings and in combination
with the latter a laterally and vertically movable valve provided with a wearing
surface of silicious or non-corrosive material, substantially as and for the purpose
set forth.
18. In an exhaust apparatus for locomotive and similar boilers, the combination
with the exhaust chamber and its division wall, an ejector provided with a steam
chamber and a cross piece containing air inlets, said cross piece resting upon or
engaging the division wall in the exhaust chamber; substantially as and for the
purpose set forth.
19. In an exhaust apparatus such as described and in combination with the hollow
base, central air pipe and transverse inlets, the confining tube surrounding said air
tube and forming the steam nozzle which latter communicates with the interior of
the base, an outer casing and a shorter inner tube, the latter in conjunction with
the casing and central confining tube forming a steam nozzle on one side and an
air passage on the other, the said steam nozzle communicating directly with the
chamber in the base and the air passage communicating through ports or openings in
the side of the casing with the surrounding space; substantially as and for the
purpose set forth.
20. In an exhaust apparatus such as described and in combination with the inner
ejector composed of an air pipe, annular steam nozzle and confining chamber an outer
ejector composed of a steam nozzle, an air passage and a confining chamber, a con-
fining chamber common to both of said ejectors, and a supplemental confining
chamber and air inlet; substantially as and for the purpose set forth.
21. In combination with the exterior casing of the main exhaust apparatus, a
supplemental flue surrounding the upper end of said casing and adjustably supported
in proximity thereto and adapted to cooperate with the passage leading to the smoko
stack, with devices convenient to the engineer connected to said supplemental flue
and serving to raise and lower the latter; substantially as and for the purpose
described.
22. In an exhaust apparatus such as described and in combination with the steam
nozzle and the passages leading thereto, a valve located within the steam chamber
and mounted upon pivoted supports so that as said valve is rotated it will be caused
to approach or recede from said steam passages; substantially as and for the purpose
set forth.
23. In an exhaust apparatus such as described, the combination with the hollow
base, central air passage and confining flue provided with flaring walls the casing
having ports or openings at or near the lower end, the tube interposed between the
confining flue and the casing, said tube forming in conjunction with the exterior
of the confining flue a contracted steam passage with outwardly diverging walls
constituting an annular steam nozzle, ports or passages connecting said steam nozzle
and the steam supply chamber and a valve arranged to open or close said ports ;
substantially as described and shown.
24. An exhaust apparatus for locomotive and similar boilers, consisting essentially
of an inner and outer steam ejector, a confining flue common to both ejectors and a
supplemental confining flue with an interposed air inlet or space; substantially as
described.
25. An exhaust apparatus for locomotive and other similar boilers located within

page_text: the uptake and delivering into the smoke stack, said exhaust apparatus comprising
an inner ejector with an inlet opposite the lower series of flues, an outer ejector
having an air inlet above the inlet to the lower ejector, a confining chamber common
to the two ejectors, a supplemental confining chamber and an air inlet to said
last named chamber opening into the upper portion of the uptake; substantially and
for the purpose set forth.