US2185242A

US2185242A - Smoke lifter for locomotives

Info

Publication number: US2185242A
Application number: US200622A
Authority: US
Inventors: James G Blunt
Original assignee: American Locomotive Co
Current assignee: American Locomotive Co
Priority date: 1936-04-01
Filing date: 1938-04-07
Publication date: 1940-01-02
Anticipated expiration: 1957-01-02

Description

Jan. 2, 1940. 3 2,185,242

SMOKE LIFTER FOR LOCOMOTIVES Original Filed April 1, 1936 2 Sheets-Sheet l INVENTOR A1"? RNEY Jan. 2, 1940. BLUNT SMOKE LIFTER FOR LOCOMOTIVES Original Filed April 1, 1936 2 Sheets-Sheet 2 INVENTOR Jim lea GB/unT AT'I RNEY Patented Jan. 2, 1940 UNITED STATES PATET 2,185,242 SMOKE LIFTER FOR LOCOMOTIVES N. Y., assignor to York, York Original application April 1, 1936, Serial No.

72,042. Divided and this application April 7,

1938, Serial No. 200,622

Claims.

This invention relates to a. smoke lifter for a locomotive and more particularly for a streamline locomotive.

This application is a division of my application for Letters Patent for improvements in Streamline locomotive, filed April 1, 1936, Serial No. 72,042, Patent No. 2,177,590, issued October 24, 1939.

An object of the present invention is to provide a smoke lifter for a steam locomotive, comprising novel characteristics including an air passage for conveying air which, on leaving the passage, operates to aid in lifting the smoke coming from the Smokestack away from the locomotive.

A further object is to provide a smoke lifter of the aforesaid characteristics having an exterior streamline surface forming a part of the streamline shroud of the locomotive.

A further object is to provide a smoke lifter so of the aforesaid characteristics having the interior defining walls of its air passage streamlined.

Other objects of and advantages achieved by this invention will be apparent from the follow- 25 ing description when considered in connection with the accompanying drawings which illustrate a preferred embodiment of the invention.

The invention is illustrated in the accompanying drawings in which only sufiicient of the parts of the locomotive are shown to afford a clear understanding of the invention and wherein Figure 1 is a diagrammatic side elevation of a streamline locomotive involving the present invention; Fig. 2 is an enlarged side elevation of the front portion of the locomotive shown in Fig. 1; Fig. 3, at the right, is a front view of the left half of the locomotive, and, at the left, is a section of the right half of the locomotive, on the line III-III of Fig. 2; and Figs. 4 to 8 are fragmental views, still further enlarged, of the locomotive showing the smoke lifter of the present invention, Fig 4 being a partial plan of the forward portion of the locomotive showing the smoke lifter, Fig. 5 a section on the line VV of Fig. 4, Fig. 6 a front end View of the parts shown in Fig. 4, Fig. 7 a section on the line VII-VII of Fig. 5, and Fig. 8 a section on the line VIII-VIII of Fig. 5.

Referring in detail to the drawings, a streamline locomotive is indicated generally by the reference numeral I, and as it is sufliciently described in my co-pending application above referred to, a brief description herein is deemed sufficient. The locomotive, as shown, includes a streamline shroud 2 which for convenience may be considered as comprising a front portion 3 extending around the front portion of the smokebox 4, an intermediate portion 5 covering the major portion of the boiler 6, and a cab portion 1. The portion of the shroud covering the top of the locomotive is substantially horizontal and free from obstructions. The shroud is formed of removable plates 8 held in place by bands 9 and by framework ribs disposed opposite each band and inside of the shroud, the first two ribs only being shown and indicated by the reference numeral 9a.

The smoke lifter, denoted generally by the reference numeral in, ma if desired, be constructed as a separate feature, and then assembled with the locomotive. The forward end of the smoke lifter is covered by a streamline covering or shroud portion ll, later to be more fully described, which forms the top: part of the shroud front portion 3. The remainder of the front portion 3 consists of the doors l2, later to be more fully described, and an extension of the lower part of the main locomotive shroud including a streamline pilot. The smoke lifter to the rear of the shroud portion H, is covered by the adjacent plates 8, These plates are removable from the smoke lifter and are held in place by the bands 9 and by other means (not shown) in a manner fully described in my before-mentioned co-pending application and it is therefore not deemed necessary to repeat the description here- 1n.

The smoke lifter is disposed around the smokestack E3 of the locomotive and extends from a point a somewhat to the rear of the Smokestack l3 forwardly to the foremost rib 9a, this portion of the lifter being within the shroud portion 5, and forwardly therefrom to the point b. It comprises at each side an air passage M, these passages meeting (but not communicating) at the rear of the smokestack, as will later more fully appear, and being entirely separated from each other forward of the smokestack by a centrally disposed structure E5. The smoke lifter I0 is disposed around the upper forward portion of the smokebox, this portion of the smokebox being denoted by the reference numeral I6.

The forward part of the lifter, that is to say the part in advance of the foremost rib 9a, comprises a bottom horizontal wall H which is straight along its rear edge to engage the front wall of the smokebox to which it is secured by the angle iron l8. The wall ll extends beyond the smokebox at each side and, at these extended portions, extends rearwardly of the front wall of the smokebox, these rearwardly extending portions being secured to the foremost rib 90. by brackets I9.

The wall I! is adjacent the upper edges of the doors l2. There is a door on each side of the front vertical center line of the locomotive, and each door is hinged respectively to the foremost frame rib 9a by hinges 2E), and secured to each other in closed position, where they meet at the front vertical center line, by aligned orificed lugs 2| which engage securing bolts. The doors are curved and are inclined upwardly and inwardly to effect a streamlining of the front of the locomotive. The front and side edges of the'wall H are curved similarly to the curvature of these doors at their upper edges, so that the doors make a tight fit about these edges of this wall. The shroud portion ll, constituting the front, top and sides of this forward part of the smoke lifter, is shaped to somewhat resemble a section of a dome, the rear edge being secured to the foremost rib 9a and curved to form a flush joint with the adjacent part of the shroud portion 5 to maintain the streamline effect therebetween, and the bottom edge being secured to the bottom wall I! and being curved to conform to the curvature of the front and side edges of said bottom wall [1 to form aflush joint with the doors l2 to maintain the streamline effect therebetween.

At each side of the centrally disposed structure l5 the shroud portion H is provided with a relatively large opening 22, which openings serve as inlets for the air to each of the respective air passages I4. These openings preferably extend from the sides of the structure l5 to substantially the sides of the dome-like wall, that is to say they include substantially the entire front of the dome-like wall at each side of the structure l5. Each of the openings is slatted and the slats 23 thereof extend entirely across the opening. ,The slats are curved at their forward edges by curvatures, corresponding to the curvature of the shroud portion II, where located, their rear edges being respectively similarly curved. The planes of the slats are substantially parallel and slightly curved and tilted from the structure l5 upwardly. The forwards ends of the slats are adjacent the structure l5 and their rear ends are near the rear edge of the shroud portion H. The slats are spaced one from the other. The bottom and top edges of each opening are substantially parallel to and spaced from their adjacent slats. The slats serve to divide the air entering an air passage I4 into suitably directed layers to enable the device to best serve as a smoke lifter.

The smokebox portion I6, which is involved in the description relating to the smoke lifter, comprises a front wall 24 which is the upper part of the front of the smokebox and which extends from the wall IT to the top of the smokebox, and the cylindrical wall 25 which constitutes the top and sides of the portion l6 and which is inclined at its lower defining lines on each side of the portion l6 from the adjacent corner of the front wall 24 upwardly and, rearwardly along lines following the contour of the cylindrical wall of the smokebox, one of these lines being shown at 2B, and the other being oppositely disposed on the opposite side of the smokebox, to a point at the top of the smokebox to the rear of the smokestack, where the two lines meet at the longitudinal center line of the top of the smokebox.

The smokestack I3 is formed as an integral ginal edges casting and the smokestack proper is of usual shape, passing downwardly through an opening in the shroud portion 5, and downwardly through the cylindrical wall 25 of the smokebox portion l6, and into the smokebox, in the usual manner.

The casting of the smokestack I3 is provided with an encircling flange 21 which is shaped to conform to the cylindrical smokebox, the marof the opening in the smokebox surrounding the smokestack extending beneath and being secured to this flange. The rear edge 28 of the flange is in a plane transverse of the smokebox. The edges 29 extend horizontally forwardly from the rear edge 28, and then turn inwardly and extend upwardly substantially parallel to the edge 28 for substantial distances, and then forwardly in curved lines around the forward part of the smokestack, meeting at the front of the smokestack at the longitudinal center line thereof. Integral with the rear portion of the flange are two aligned steam pipes or passageways 3G. The passageways have substantially horizontal portions which extend in directions transverse of the smokebox. They extend through the flange 2?, the inner ends of these portions being below the flange and the outer ends being above the flange and the top faces of these outer ends are extended forwardly and rearwardly beyond the passageways and from the rear end downwardly in a forward direction forming an inclined surface indicated at n, best shown in Fig. 5. In practice the outer ends 3| of the passageways are extended through the smokebox to the exterior, the smokebox being cut away to provide for this, and are connected with steam pipes leading from steam exhausts of locomotive auxiliaries. The passageways extend from their outer ends 3i transversely of the smokebox and, when reaching a point near the longitudinal center line of the smokebox, are directed upwardly, terminating at, or slightly below, the top of the smokestack. These upwardly directed portions are disposed adjacent to each other and to the rear portion of the smokestack, and their rear walls are streamlined, as best shown in Fig. 4. The casting is further provided with forwardly projecting spaced lugs 32 disposed well toward the sides of the smokestack for a purpose presently to appear.

The structure l comprises two vertical side walls 33 which are secured at their rear edges to the respective lugs 32, the portion of the smokestack between these lugs constituting the rearmost portion of the rear wall of the structure if"). The side walls 33 extend forwardly, in a direction longitudinally of the lifter, between the smokebox cylindrical wall and shroud portions 5 and H to the points d at'the tops and to the front of the smokebox at the bottoms, the shroud portions and the smokebox cylindrical wall between these side walls, as thus far described, constituting respectively the rearmost portions of the top and bottom walls of the structure E5. The side walls then extend downwardly, the rear edges of the downwardly extending portions being adjacent to the front wall 24 and extending to the wall H, the wall 24 between the side walls 33 thus constituting the remaining or lower portion of the rear wall of the structure IS. The lower edges of the side walls 33 then extend forwardly along and adjacent to the wall I! to the forward edge of this wall ll, the portion of this wall ll between the side walls 33 thus constituting the remaining or front portion of the bottom wall of the structure l5. The top edges of the side walls 33 extend forwardly and downwardly from the points (I along and adjacent to the curved outer wall of the shroud portion H to points indicated at e, the top edges of the side walls being suitably curved corresponding to the curvature of the shroud portion l. The edges of the side walls 33 extend horizontally forwardly from the points e to points 1 substantially vertically above the front edge of the wall ii and the front edges of these side walls extend vertically downwardly from the points f to the wall ii.

The shroud portion H is cut away, as will presently appear, and with this in mind, it is noted that, as thus far described, the structure i5 is open at the front and also open at the top of the front portion. This front portion is closed by a wall 36 of somewhat dome or arch shape, the front edge of which is in line with the front edges of the side walls and extends on either side to the points 1, the bottom edges of which extend rearwardly from the points 1 to the points e adjacent the edges of the side walls 33 between these points, and make a flush joint thereat with the side walls, the top of which extends from the front edge horizontally rearwardly in line with the top edge of the shroud portion 5 until it meets the top of the shroud portion I at the point d, the edges of which, between the two points c and the point 01', are adjacent the shroud portion H and being suitably curved to conform to the curvature thereof, as shown in Fig. 5, the shroud portion l| being cut away along these lines of contact, and the lines of contact with the walls 33, as indicated approximately by the lines 35, Fig. 4, which extend from the point (1' to the wall ii. The wall 34 and the shroud portion between the side walls 33 and the wall 34 constitute the remaining portion of the top wall of the structure it, and the opening at the front of this structure, defined by the forward edges of the side walls 33, the forward curved edge of the wall 34 and the front edge of the wall I! between the side walls 33, is closed by a wall 38 of a contour similar to the contour of said opening.

A shelf 3'! is secured to the side walls 33 near the forward ends thereof for the reception of a horn (not shown), the mouth of which will ex tend in practice through an opening 38 formed in the top portion of the wall 36. A head lamp (not shown) for the locomotive may be secured to the wall 36 below the opening 38 in any manner desired.

From the foregoing description of the centrally disposed structure it will be noted that the structure forms a dead space separating the two air passages i4 and is entirely enclosed except that the wall ll between the side walls 33 is provided with a large opening 39 affording communication between the space within the structure 5 and the space to the rear of the doors 2. The side walls 33 are disposed approximately in line with the sides of the smokestack so that the exterior of the smokestack will not obstruct the free passage of the air through the passages i4, presently to be described.

The passages it are similar in all respects and therefore a description of one will be suflicient. The rear portion of the lifter, that is to say the portion to the rear of the smokestack, is divided at the longitudinal center into halves, as will later be described, each half constituting the rear portion of the passage Hi on its side of the lifter.

.Bearing this in mind, this rear portion will be described, for the present, as if it were a single curved passageway. This passageway is denoted by the reference numeral 4|], and extends in general direction transversely of the locomotive and has open ends, and an open top preferably just below the top of the Smokestack, that is to say in line with the top of the shroud portion 5, the top of this rear portion or passageway being slightly curved, that is to say suitably shaped to conform to the shape of the corresponding portion of the top of the shroud portion 5. The rear walls of the vertical portions of the steam pipes 36, together with small sections of the smoke stack adjacent the outer ends of these rear walls and extending to the adjacent shroud supports 4| provide a wall 42 serving as a forward wall of the curved passageway 40. The supports 4| form part of the smoke lifter although they may be employed in a streamline locomotive such as that of said aforementioned application Serial No. 72,042 for supporting other features of the locomotive, and reference may be had to said application for a fuller description of these features. Sufice it to say, in connection with the present invention, that these supports 4| are connected at their inner ends to the smokestack by means of angle irons m and at their outer ends to the second of the frame ribs 9a, one being shown in Fi 4.

The passageway 40, which is disposed between the shroud portion 5 and the top of the smokebox, further comprises a rear wall 43 having a vertical portion 44 which is shaped to conform to the shape or curvature of the adjacent part of the shroud portion 5 and is provided at its upper edge with a rearwardly extending flange 45 which overlaps the adjacent margin of the shroud portion 5, a similarly shaped angle iron 46 being secured to the rear face of the wall portion 44 with its rearwardly extending leg adjacent the shroud portion 5 to afford a support for the shroud portion 5 at this location. The wall portion 44 is curved from the center in a forward direction on both sides and extends to the shroud supports 4|, it being secured at each end to the adjacent shroud support 4|. At the bottom edge of the portion 44 the reariwall 43 extends downwardly and forwardly, forming thereby an inclined portion ll having its lower edge 0 curved from the center in a forward direction on both sides to the flange 27 in line with the shroud supports 4|, the ends of this portion 47 and the portion 44 terminating in substantially vertical lines 19, (see Fig. 8) extending from the respective shroud supports 4| to the bottom of thc'passages M for a purpose later to be mentioned. The passageway 4!! is further provided with a bottom wall 48 which extends from the bottom edge of the wall portion 4i forwardly and downwardly until it meets the flange 21 and inclined top faces of the pipes 36 along a line shown approximately at g, Fig. 4. These inclined faces between the line 9, the forward wall 42 and the ends of the passageway 40 serve as the remaining portion of the bottom of the passageway 4|).

It will thus be seen that the passageway 4|] is open at the top and is enclosed at its bottom and rear by walls that are curved or shaped to best conform the top of the passageway 40 to the shape or curvature of the shroud portion 5 and that at the bottom are straight across transversely of the lifter. The walls are further curved forwardly from each side of the longitudinal center line of the lifter, and furthermore are, in general direction, inclined upwardly from the front rearwardly, which most efficiently directs the air entering the passageway 40 at the ends thereof upwardly through the open top for producing a maximum lifting effect to the smoke passing rearwardly from the smokestack as it engages the streams of air coming from the open top or mouth of the lifter.

To better provide for a maximum lifting result, the ends of the passageway 40 are made considerably wider than the middle so that the entering streams of air will be reduced in volume as they advance toward the center, and increased in intensity, thereby increasing their lifting capacity. To still better provide for this lifting capacity the passageway M1 is slatted throughout its open top by a row of suitably spaced vertical slats 49 extending longitudinally of the lifter. The upper edges of the slats are in substantially the same plane as the top, of the passageway 50 (that is to say the top of the shroud portion 5) and extend downwardly for a short distance into the passageway 40. They are connected at their rear ends to the wall portion 45 and some of them at their forwardends are connected to the rear faces of the shroud supports 4! and the remainder of them are connected to a band 55 which is secured at its ends to the shroud supports 4| and is adjacent to and follows the contour of the wall- 42, thereby maintaining the streamline effect at this location, all as shown in Figs. 4 and 5.

Instead of a centrally disposed slat, the wall 5| is substituted, which extends transversely throughout the passageway 4!] and is secured at its rear and bottom ends to the

wall portions

44 and 41 and to the wall 43. Its forward end is bolted to a flange 52 extending rearwardly from the rear wall of the vertical portions of the pipes 30. This wall 5| divides the passageway fill so that there is no commingling within the lifter of the oppositely directed streams of air flowing therethrough from the opposite ends. The wall 51, through its connection with the flange 52, connects the rear of the smoke lifter with the locomotive.

As previously stated, while, for convenience, the rear portion of the smoke lifter has been described as if it were a single passageway, it actually comprises, due to the dividing wall 5|, the two rear portions, indicated respectively by the reference numeral 53, of the two air passages I l. The forward portions 54 of these passages M are similar in all respects, and therefore a description of one will suflice.

Similar to the rear portion 53 the forward portion 55 from the front opening 22 is directed, generally rearwardly and upwardly, and decreases in cross-sectional area from the cross section of largest area at the front portion to the cross section of smallest area at the rear end, this end being substantially the same in size and shape as the adjacent forward end of the respective portion 53, and the adjacent walls of the two

portions

53 and 54 meeting in substantially flush joints, thereby obviating any obstruction to the smooth flow of air through the passage M. In short, there are no obstructions in the passage I4 to offer any resistance to the air, and the walls of the passage are shaped and directed to obtain a maximum of smoke lifting effect at the outlet at the rear of the Smokestack. This is further enhanced by the, generally speaking, converging walls characteristic of the passage I4 which acts to intensify the smoke lifting power of the air which rushes into the passage l4 through its opening 22 as the locomotive moves forwardly.

The portion 54 of the passage I4 is completely enclosed by top, bottom and side walls, thereby confining all the air that enters through the opening 22 until it leaves the portion 54 at the rear end and enters the portion 53, from which it emerges at the top in rectangular columns provided by the slats 49, the length of these columns being directed longitudinally of the locomotive, which in actual practice has proven to provide a satisfactory lifting of the smoke to convey it, to a maximum extent, away from the top and sides of the locomotive and cars at the rear.

The walls defining the portion 54 are comprised of a wall 55 which is flat and relatively narrow. It preferably is straight across in a transverse direction, that is to say it has no inclination in this direction. Its forward end 55 is supported by the adjacent rearwardly extending portion of the wall I! a little to the rear of the front wall of the smokebox, this end being slightly spaced from the adjacent part of the cylindrical wall of the smokebox. The wall 55 is inclined upwardly from its forward end rearwardly, and its outer and inner edges 51 and 58 respectively are inclined from their forward ends inwardly except that the edge 51, from its forward end, is directed longitudinally rearwardly, with no inclination inwardly, until it reaches the foremost rib 9a. The upward and inward inclinations of the wall 55 are such that its rear edge rests upon the portion 59 of the correspondingly inclined wall of the adjacent pipe 30, where the wall 55 meets the adjacent edge of the wall 48 which is similarly supported on the inclined wall of the adjacent pipe 30. The wall 55 is supported at various intermediate points by brackets 60 which are secured to the sides of the cylindrical wall of the smokebox, and the edge 58 is suitably shaped to follow the cylindrical wall of the smokebox in slightly spaced relation therewith and defines the bottom of the smokebox portion 15.

A curved wall 6! is similarly spaced from the cylindrical wall of the smokebox, and forms another portion of the forward portion 54 of the passage M. It has its lower edge connected to the inner edge 58 of the wall 55, this edge of the wall 5| being suitably shaped for this purpose. The wall Bl from this edge is curved corresponding to the curvature of the cylindrical wall of the smokebox, and its upper or inner edge meets and is secured to the outer face of the adjacent side wall 33 of the structure l5 in slightly spaced relation from the cylindrical wall of the smokebox. The rear edge of the wall 5! meets and is secured, at its margin, to the flange 21. The forward edge 62 of the wall 6| is in substantial alignment with the forward end 55 of the wall 55, is disposed in a vertical plane transverse of the locomotive, and, as is obvious, is curved corresponding to the cylindrical wall of the smokebox, extending from the lowermost point of the wall 55, which is supported on the wall ll, at its lower or outer end h, to the adjacent side wall 33 at a point near the cylindrical wall of the smokebox, at its upper or inner end.

A wall 63 is disposed in the angle formed by the plane of the edge 52, the wall H and the adjacent wall 33. This wall 63 is curved and shaped somewhat like a quarter of a hollow cone, formed by cutting planes represented by the wall I1 and adjacent wall 33, with its apex 2' disposed in the angle formed by the meeting of the adjacent wall 7 33 with the wall ll, with its base 7' (which is the rear edge of the wall 63) engaging the edge 62, with the rectilineal element is, formed by one of the cutting planes (wall ll), constituting the bottom edge of the wall 63, and with the rectilineal element Z, formed by the other of the cutting planes (adjacent wall 33), constituting the side edge of the wall 63.

It will be noted that the space within the section of the cone forming the wall 53 is closed and forms no part of the passage i i, the exterior of the wall 63 being for the purpose of streamlining the forward part of the passage Hi to permit a smooth flow of the air upon entering the passage, or in other words it covers the included portion at the front of the smokebox which, due to its being directed transversely to the air flow, would, were it not for the wall 63, create a large resistance to the air entering the passage M.

It will thus be seen that the bottom wall of the forward portion 5 3 of the passage I4 is composed of the walls 63, 6! and 55, that the wall 55 is inclined upwardly and inwardly from its front end to its rear end, that the wall 6!, at its outer (lower) edge is similarly inclined upwardly and inwardly, the wall 5! thereby gradually decreasing in width from the front end to the rear end, and also that the walls 55 and 6!, at their upper edges, meet the pipe wall 59 and flange 2'! respectively as aforesaid, the wall 48 likewise, as aforesaid, meeting the pipe wall and flange, The parts at this location combine to form a smooth even surface which offers no obstruction to the air passing through the passage I 4.

A curved wall 64 forms the top wall of the forward portion 54 of the passage It. This wall 6d, at its forward edge 65, follows the curvature of the adjacent curved wall of the shroud portion II, and engages this shroud portion H. Its inner (upper) side edge 66 engages the adjacent wall 33 near the top thereof, and extends at its rear around the adjacent portion of the smokestack, and is secured thereto by an angle iron 6'5. The rear end 68 of the wall 64 extends under the adjacent shroud support il to which it is secured, thereby locating the top of the portion 54 of the passage M at its rear end substantially on a line with the bottom edges of the slats 49. The wall 64 is curved outwardly and downwardly from its inner (upper) edge in a manner to provide the required cross-sectional areas for this forward portion 54 of the passage l4, until it reaches a line vertically above the edge 51 of the wall 55, at which location it extends downwardly substantially vertically and inwardly from the front to the rear, meeting at its bottom edge the edge 51, the rear edge of this vertical portion of the wall 64 meeting the adjacent end edges of the wall portions 44 and il.

It will thus be seen that the top wall of the passage It comprises the wall 54 and the adjacent portion of the shroud portion M. It will further be seen that the forward portion 56 of the passage M is disposed entirely beneath the shroud portions 5 and H and that the passage I4 is entirely enclosed except at its front and rear ends.

While some of the brackets and angle irons employed in securing the various parts have been referred to, it will be appreciated that such, or other appropriate means, including welding, are employed to secure the various parts together, as found necessary. Furthermore, as previously stated, the smoke lifter may be made as a separate structure, and then assembled with and se- 5 cured to the various appropriate parts of the locomotive and shroud portions.

While the invention has been illustrated in the foregoing description in a streamline locomotive of preferred construction, it will be understood that many and various changes and modifications in form, arrangement of parts and details of construction thereof may be made, and that all such changes and modifications as fall within the scope of the appended claims are contemplated as a part of this invention.

The invention claimed and desired to be secured by Letters Patent is:

1. In a locomotive, the combination of a smokebox; a smokestack projecting upwardly from the top of said smokebox and spaced rearwardly from the front thereof; a streamline covering surrounding the top, sides and front of a forward upper portion of said smokebox and separated therefrom to provide an intervening space, said smokestack opening through the top of said covering; means closing said space to provide a passageway disposed centrally of said portion and extending in a direction longitudinally of said locomotive from the front of said covering to a point spaced rearwardly from the rear of said Smokestack for the passage of air through said closed space; and a partition extending longitudinally of said passageway and disposed centrally relative thereto and being adjacent to and extending from the front of said smokestack forwardly to the front of said covering and downwardly between said front of said covering and said front of said smokebox to the bottom of said front of said smokebox portion, dividing said passageway adjacent thereto into two substantially equal sections, each being disposed at least in part opposite the portion of said front of said smokebox portion at the corresponding side of said locomotive and being open through said front of said covering providing an opening for the admission of air, and said sections being open through said covering at the rear of said smokestack for the emission of said air, each of said sections being in part adjacent a side of said smokestack.

2. In a locomotive, the combination of a smokebox; a smokestack projecting upwardly from the top of said smokebox and spaced rearwardly from the front thereof, a streamline covering surrounding the top, sides and front of a forward upper portion of said smokebox and removed therefrom to provide an intervening space, said Smokestack opening through the top of said covering; means closing said space to provide a passageway disposed centrally of said portion and extending in a direction longitudinally of said locomotive from the front of said covering to a point spaced rearwardly from the rear of said Smokestack for the passage of air through said closed space; a partition extending longitudinally of said passageway and disposed centrally relative thereto and being adjacent to and extending from the front of said smokestack forwardly to the front of said covering and downwardly between said front of said covering and said front of said smokebox to the bottom of said front of said smokebox portion, dividing said passageway adjacent thereto into two substantially equal sections, each section being open through said front of said covering providing an opening for the admission of air, each said opening being disposed at least in part opposite the part of said front of said smokebox portion at the corresponding side of said partition and said sections being open through said covering at the rear of said smokestack for the emission of said air, each of said sections being in part adjacent a side of said Smokestack; and a covering disposed in each of said sections adjacent said partition, each enclosing and adjacent its correlated part of said front of said smokebox portion, extending forwardly therefrom in streamlined contour to offer minimum resistance to air entering said opening adjacent thereto.

3. In a locomotive, the combination of a smokebox; a smokestack projecting upwardly from the top of said smokebox and spaced rearwardly from the front thereof; a streamline covering surrounding the top, sides and front of a forward upper portion of said smokebox and removed therefrom to provide an intervening space, said 'smokestack opening through the top of said covering; means closing said space to provide a passageway disposed centrally of said portion and extending in a direction longitudinally of said locomotive from the front of said covering to a point spaced rearwardly from the rear of said smokestack for the passage of air through said closed space, said means including a wall at each side of said smokebox portion between said smokehox portion and the adjacent side of said covering providing bottom walls for said passageway; and a partition extending longitudinally of said passageway and disposed centrally relative thereto, comprising a part disposed to the rear of said Smokestack and a part disposed adjacent to and extending from the front of said smokestack forwardly to the front of said covering and down- Wardly between said front of said covering and said front of said smokebox to the bottom of said front of said smokebox portion, said partition dividing said passageway into two substantially equal sections, each being disposed at least in part opposite the portion of said front of said smokebox portion at the corresponding side of said locomotive and being open through said front of said covering providing an opening for the admission of air, and open through said covering at the rear of said smokestack for the emission of said air, each of said sections being in part adjacent a side of said Smokestack.

4. In a locomotive, the combination of a smokebox; a Smokestack projecting upwardly from the top of said smokebox and spaced rearwardly from the front thereof; a streamline covering surrounding the top, sides and front of a forward upper portion of said smokebox and removed therefrom to provide an intervening space, said smokestack opening through the top of said covering; means closing said space to provide a passageway disposed centrally of said portion and extending in a direction longitudinally of said locomotive from the front of said covering to a point spaced rearwardly from the rear of said smokestack for the passage of air through said closed space; box-like means closed against admission of currents of air from the outside of said locomotive extending longitudinally of said passageway and disposed centrally relative thereto and being adjacent to and extending from the front of said Smokestack forwardly to the front of said covering dividing said passageway adjacent thereto into two substantially equal sections, said front of said covering being open providing inlet means for the admission of air to said sections, said inlet means being disposed at least in part opposite said front of said smokebox portion, and said sections being open through said covering at the rear of said Smokestack for the emission of said air, each of said sections being in part adjacent a side of said smokestack;

and covering means disposed in said closed space enclosing and adjacent said front of said smokebox portion opposite said inlet means, extending forward from said smokebox portion in streamlined, contour to offer minimum resistance to air entering said inlet means.

5. In a locomotive, the combination of a smokebox; a smokestack projecting upwardly from the top of said smokebox and spaced rearwardly from the front thereof; a streamline covering surrounding the top, sides and front of a forward upper portion of said smokebox and removed therefrom to provide an intervening space, said Smokestack opening through the top of said covering; means closing said space to provide a passageway disposed centrally of said portion and extending in a direction longitudinally of said locomotive from the front of said covering to a point spaced rearwardly from the rear of said Smokestack for the passage of air through said closed space; box-like means enclosed against admission of currents of air from the outside of said locomotive extending longitudinally of said passageway and disposed centrally relative thereto and being adjacent to and extending from the front of said smokestack forwardly to the front of said covering and downwardly between said front of said covering and said front of said smokebox to the bottom of said front of said smokebox portion, dividing said passageway ad jacent thereto into two substantially equal sec- I tions, each section being open through said front of said covering providing an opening for the admission of air, each said opening being disposed at least in part opposite the part of said front of said smokebox portion at the corresponding side of said box-like means, and said sections being open through said covering at the rear of said smokestack for the emission of said air, each of said sections being in part adjacent a side of said smokestack; and a covering disposed in each of said sections adjacent said box-like means, each enclosing and adjacent its correlated part of said front of said smokebox portion, extending forwardly therefrom in streamlined contour to offer minimum resistance to air entering said opening adjacent thereto.

JAMES G. BLUNT.