CERTAIN IMPROVEMENTS IN THE CONSTRUC- TION OF STEAM BOILERS AND STEAM ENGINES, AND IN STEAM VESSELS, AND THE MACHINERY FOR PROPELLING THE SAME
Year: 1846

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES-
MONTGOMERY, of Salisbury Street, in the County of Middlesex, Engineer, send
greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent, under the Great Seal of Great Britain, bearing date at
Westminster, the Twenty-sixth day of May, in the ninth year of Her reign,
did, for Herself, Hei heirs and successors, give and grant unto me, the said
James Montgomery, Her especial licence,, full power, sole privilege and
authority, that I, the said James Montgomery, my exois, admois, and assigns,
or such others as I, the said James Montgomery, my exois, adñiors, or assigns,
should at any time agree with and no others, fiom time to time and at all
times hereafter during the term of years therein expressed, should and law-
fully might make, use, exercise, and vend, within England, Wales, and
Town of Berwick upon Tweed, and in the Islands of Guernsey, Jersey,
Alderney, Sark, and Man, and also within all Her said Majesty's Colonies and
Plantations abroad my Invention of "CERTAIN IMPROVEMENTS IN THE CONSTRUC-
TION OF STEAM BOILERS AND STEAM ENGINES, AND IN STEAM VESSELS, AND THE
MACHINERY FOR PROPELLING THE SAME," in which said Letters Patent is contained
a pioviso, that I the said James Montgomery, shall cause a particular descrip-
tion of the nature of my said Invention, and in what manncı the same is to be
performed, to be inrolled in Her said Majesty's High Court of Chancery
within six calendar months next and immediately after the date of the said in
part recited Letters Patent, as in and by the same, reference being thereunto
had, will inore fully and at large appear.

page_text: NOW KNOW YE, that in compliance wfth the said proviso, 1, the said
James Montgomery, do hereby declare that the nature of my said Invention, and
the manner in which the same is to be performed, are fully described and
ascertained in and by the following statement thereof. reference being had to
the Diawings hereunto annexed, and to the figures and letters marked thereon,
that is to say
My Invention consists in certain improvements in steam boilers and in
steam engines and steam vessels, and the machinery for propelling the same
The improvements which I have made in steam boilers have in view
principally a more economical mode of using the fuel than that ordinarily
adopted, the burning of the smoke, the establishing of a perfect circulation
of water through the vertical tubes which constitute a component part of my
boiler, the depositing of sedimentary matter in a receptacle below the part on
which the fire has a direct operation, and the consequent prevention of inci usta-
tion, and also the preventing of the passing of water through the steam pipe
and into the cylinder fiom foaming or other causes.
In Fig. 1 of the accompanying Drawings, I have given a side elevation
of my boiler and furnace, together with a part of the steam engine and
propelling apparatus diawn to a scale of one-fourth of an inch to the
foot. Fig 215 a vertical section through the boiler and through the-fui-
nace by which it is heated Fig 3 is a horizontal section through the
furnace in the line x, x, of Fig 2 Fig 4 is a back clevation of the boiler,
which is furnished with doors to give admittance to the pait containing the
vertical tubes, one of which doors is represented as open Fig. 5 is a top view
of the boiler and of a portion of the furnace, and Fig 6 15 a front elevation of
that part of the boiler that contains the tubes, the furnace part being removed,
the section being in the line 6, 0, of Fig.2 From 2 to 6 inclusive the Figures are
drawn on a scale of half an inch to the foot Wherever the same parts recul in
the respective Diawings, they are designated by the same letters of reference
A, A, Fig 2, is the fire chamber of my furnace into which the fuel is to be
fed through a series of doors B, B, Fig 1 C, C, are the grate bars D is the
-ash pit E, E, are vertical tubes through which the water is to cnculate
These tubes pass through suitable heads F, F The case or body of the boiler
that contains the tubes I have represented as rectangular, but I intend some-
times to make it cylindrical, or to vary its form in other ways. The fire chamber
A, A, I sunround by a water space G, G, which is continued on the sides of the
containing case of the vertical tubes II, H, is the steam chamber, I, I, the
water line, J, J, that portion of the boiler that is below the lower tube head;
and K, K, the bottom of the boiler. This bottom is made convex outwards,

page_text: and may be either spherical or comical, and as the heat from the fire does not
act on this bottom, the water contained between it and the lower tube head
will be in a state of comparative quiescence, in consequence of which the scii-
mentary matter, from which incrustations are ordinarily formed on the bottoms
and other parts of boilers, will settle down in a loose unaggiegated state By
means of a tube L, and a cock M, or by the aid of an ordinary valve, the
accumulated sediment may at any time be blown off without occasioning any
considerable waste of water
The flame and heat from the fire chamber I direct, first, against the upper
ends of the vertical tubes, and then upon their lower ends, and to effect this
I place a partition or diaphragm N, N, so as to divide the larger portion of the
chamber containing the tubes into two parts, an upper and lower chamber.
This will duect the draught, as indicated by the arrows, fust into the space
above the diaphragm, around which it will pass to the chamber below the
diaphragm, thence into the flue space O, O, below the ash pit, and thence to
the chimney P
Q, Q, Fig 2, 15 a shield, consisting of a plate of metal placed below the
boiler head at such distance therefi om as to allow of a steam passage between
the two, its diameter is somewhat less than that of the boiler head so as to
allow the steam from the steam chamber to pass into it whilst it completely
covers the upper ends of the vertical tubes By this arrangement of the shield
the steam is drawn equally from all parts of the cucumference of the boiler;
the foaming of the water when the pressure is taken off by the admittance of
steam into the cylinder will also be in great measure if not entirely prevented,
and the injurious and not unfiequently destructive result of the passing of
water into the cylinder obviated R, R, is the steain pipe leading from the
middle of the boiler head to the engine.
The producing of a fice and continuos cuculation of the water in a boiler
has been frequently attempted. but has not been, as I am well assured, hither to
attained, but by my plan of arranging the respective parts of the boiler in such
way as that its bottom shall not be subjected to the duect action of heat, and
of introducing it laterally among the vertical tubes at the upper ends, I not
only secure the ready depositing of the sediment as stated, but effect a rapid and
decided cnculation, which prevents all incrustation on the interior of the tubes
and at the bottom of the boiler, and also augments the quantity of steam
generated I have represented the diaphragın as situated at about one-thud
of the height of the boiler from its top, but it may be placed near its middle,
or lower down if preferred, the file chamber also being depressed to accord
therewith

page_text: . S, Fig 4, is a stopper or man-hole, which may be removed for gaining access
to the lower part J of the boiler T, Fig 5, is the top of the boiler, and U, U,
man-holes therein V, Tig 6, is a plate at the rear end of the fine chamber and
ash pit, above which the diaught enters among the tubes, and below which it
returns on its way to the chimney. The fuel is to be fed into the furnaces at
the sides where there are a series of doors-B; B, (Fig 1-)---The-fire is to be
ignited at the part nearest to the boiler, and successively through the doors
more and more distant from it, the object of which is always to keep a clear
fire towards the boiler, the fireman moving the fuel which has ceased to give
out smoke gradually forward, and giving the new supply at a distant door so
as to cause the smoke to pass over the clear fire, by which means it will be
completely burnt, the unavoidable leaking in of atmospheric air being sufficient
to produce that result, an additional supply may, however, be given should it
be found necessary. W, W, (Fig 2,) is a wasto steam pipe leading from the
.ordinary safety valve into the ash pit D. This pipe will conduct the steam
that escapes through the valve, whether in small or large quantities, into said
ash pit, and when the quantity is large from the effect of too great pressure, the
steam will have the effect of damping, the fire, and thus of regulating the
pressure.
'
Figs 7 & 8 represent on an enlarged scale the manner in which-I-secure the
top of the boiler in place, and pack it so as to render it steam-tight T, T, is
a part of the top of the boiler, and X one of its sides To the sides of the
boiler (Fig 7) are firmly affixed by screw bolts or otherwise grooved pieces Y,
which receive corresponding pieces Z attached to the top T These parts are
so formed as, to enable the top of the boiler to be slid into place like a sliding
box lid, after which the top is to be wedged up by means of wedges a To
pack it 1 introduce a cold or 10pe-formed packing into a recess picpared to
1cceive it, and this when acted on by the steam will be forced into its recess
with a power proportioned to the pressure of the steam.
Fig. 8 shows the manner of securing the top at the back end of the boiler;
c in this Figure and in Figure 5 being sciew bolts by means of which this is
effected The tubes E are made to enter the lower tube head by conical
fittings, and the upper head by means of sciews Fig 9 is a view of the top
ends of the tubes, which are furnished with notches on projections d, d,
to receive a wrench to turn them. In the section, Fig 10, e are screws
on the upper ends of the tubes, and f, conical terminations at then lower
ends, after being sciewed in place. the lower conical projections, which extend
somewhat below the lower tube head, are turned over upon it and closed down
fumly.

page_text: In Fig 11 have represented the manner in which I anange my steam enginė
so as to cause it to occupy the lowest pait possible of the vessel, by which means
its weight is most advantageously situated, and it is secured from the effects of
shot when placed on board ships of wai A, A', are two cylinders which are
vertical, but in an inverted position, the cross heads B' being below them,
and the bed plate to which they are bolted being above them; an edge view
of this bed plate is in part shown at fall fl c', c', aic' stout vertical 1ods that
seive as slides to the cross heads, and also to brace and sustain the cylinders,
then extending down from them to the keelson o lower timbers of the vessel,
The
and then length being such as to admit the required length of stroke
crack shaft is peculiar in its construction, the cranks that work the closs
heads of the respective cylinders stand at right angles to each other, as in other
double cylinder engines, but I connect the crank shafts of the respective
cylinders by means of a coupling link, instead of making the shaft continuous,
01 of connecting them by means of a coupling box D', D', are the crank
shafts; E, E, the plummer blocks in which they run which plummer blocks
are made fast on the bed plate F, F. are the connecting rods between the
cranks and the cross heads G. is a connecting link that is received on the
wrist pins of the two contiguous crank shafts, and which is so placed as to keep
the cranks of the two cylinders at right angles with each other By this
arangement the two cylinders may be placed very near to each other; the
ciank shafts may be made much shorter than when a coupling box is used
to connect the two, and they are better sustained by the plummer blocks
I, Fig 1, is a shaft that is coupled to the crank shaft of the steam engine
and to the shaft of the propelling wheel This shaft is peculiar in its con-
struction, its coss sections, excepung at its extreme ends, being in the form of
a rectangular cross, as shown in Fig 11. They are made of wrought iron, by
rolling or otherwise, and it will be manifest that they possess great strength
combined with lightness, it is believed that in this respect they will be found
superior to those in any other form They also present another important
advantage in then elasticity, not longitudinally, but in their slightly yielding to
any power that tends to twist them, this will be found of great importance in
many applications, and particularly in its application to a propelling wheel,
where the shocks to which the propellers are subject, that might be sufficient
to break an unyielding shaft, would be eased off by the elasticity of the shaft
Just described. On the ends of this shaft pieces are to be welded where it
uns in plummer blocks or other supports The large sui face exposed by
these shafts tends to prevent their heating and then gudgeons inay be made
hollow, which will also aid in producing a like result I' is the propelling

page_text: wheel, which is of the screw kind, and is diven directly by a line shaft fiom
the engine. This wheel is so aanged and combined with the other parts of
the machinery as to allow of its being raised entirely above the water line o
on deck, if desired, the raising being effected by the direct action of the engine
J' is a clutch box which when not clutched to the shaft II', iemams stationary,
the elongated portion of said shaft revolving within it. Ihe shaft K¹ 15
shown most distinctly in the section, Fig 12 is a clutch that is to engage
with the clutch box J' and when coupled, as shown in Fig 12, said box will
revolve with the shaft The propelling wheel bas its gudgeons in a shde L'. I.,
and to this is attached the wire ropes or chains M. M, that pass over pulleys
h, 1.1, the two 1opes or chains may be connected together at or about the
pulley 2, in which case the end M". that descends to the clutch box J' will be
single, and this winding on of the rope or cham will raise the propelling wheel
The slide ses between the vertical posts N¹ N", and in order to allow it
to be raised its axle must be unclutched from the shaft K. The clutch box
by which this is effected is shown at O¹, duectly opposite the vertical post N¹
This aangement is necessary in order to allow the wheel to be raised up
between said posts lg 13 is a face view of the vertical post N¹, and of the
end of the shaft K', so formed as to receive the coupling box O', the face of
which is seen in Fig 147,7,sa rod for working-the-clutch -box-O'-and-
which may extend up to the deck of the vessel PP is a stuffing box that
sunounds the shaft K, and which is made fast by 11vets or screws to the
post N¹
1 15 a metallic ung fitted into the stuffing box P, and around the
shatt K, which it serves in part to sustain 2, 7, is a 1od, which passing at its
lower end through a sciew nut, seives to raise on lower a sliding valve m,
which will effectually close the opening through the post N. and allow of such.
examination and repans as may be necessary after the propelling whicel las
been raised igs. 15 and 16 show another modification of my manner of
anarging the propellers to be raised and lowered, and admitting also of the
substituting of propellers varying in size when greater or less power may be
requned
Fig 15 shows the stein of a vessel carrying two propellers Q&
Q1, varying in size 'These propellers are fixed on the end of aims R¹, R',
which aims move on strong hinge joints at S', S' The manner of raising them
is shown at lig 16, the side of the vessel being removed for the purpose of
exhibiting the operating parts T, 1", are clutch boxes on the propeller shaft
around each of which a double wie rope passes in opposite duections, and
will scive to raise or lower one or other of the propellers, as the case may be,
sand 1opes or chains passing over pulleys oo, and being operated upon by the
clutching and unclutching of the boxes T, T. m is a valve similar to that

page_text: shown at m, m Fig 1, but so situated as that the propelling shaft must be
drawn back in order to close it. P, P¹, is a stuffing box round the propeller
shaft. To hold the propeller in place when down, there is a screw shaft q, %,
that screws down into suitable staples 1 The end of the propeller shaft is
curved to fit the sweep of the propellers 11sing, as shown at U', Figs 15
and 17 It will be seen that under the foregomg aangement either of the
propeller wheels Q' and Q" may be brought into action. V₁, V', 15 the rudder,
which is of the balance kind, the rudder post W, WI, passing through it,
excepting at its centic, where it is made bow form, as seen in the face view of
it at X, Y being the propelling shaft passing though it Figs 19 to 26
inclusive represent the manner in which I roll the wrought-non plates for the
constructing of vessels, builcis, or other articles where the scams are straight
or nearly so In some of these Figures the lapping is formed from the plates
themselves (Z, Z¹), in which case a single row of vets Z will be sufficient
to bind the plates together In other cases a stup of rolled metal 7 is placed
along the seams, which must in that case be secured by a double 10w of 11vets,
as represented Fig 27 shows the manner in which I construct my wrought
ion grate bars by rolling, giving to them a V form that shall retun the
aslics,
and to prevent the burning out of said bais I sometimes roll two
skelps in a proper form for vetting them together at their lower edges, as
shown in Fig 28 I usually anange my grate bais so as to form an arch, as
represented in Fig 35 My next improvement consists in a peculiar manner
of applying expanding bais o 1ods to the boilers of steam engines for the
purpose of preventing explosions by damping the fine before the point of
danger is reached, which expanding bars are applicable to steam boilers of
vanous kinds, but in the accompanying Diawing I have represented them as
attached to my boiler with vertical tubes In applying it to other boilers the
plan must of course be so modified as to adapt it to the particular purpose
without departing from the general principle In Fig 3, 3, 15 a 1od which
is made fast to the fiont furnace plate, as at t, it passes through suitable
stays to prevent its bending, is jointed at its rear end to a rod u, and this at
its opposite end is jointed to a 1od v. that passes to the front of the boiler,
to is a rod that passes from the 10d w, through a stufling box a, and is made
fast to an immoveable bulk head at y, the 1od w consequently remains
stationary, the expansion of the boiler and 1od by heat will therefore have the
effect of causing the boiler to slide back on the rod w, and will cause the
rod w to force the 1od v, v, forward The 1od v, v, passes through a stuffing
box at a' on the front of the boiler, and its end bears against a 10d b', which
is attached by a joint pin to a short aim or stud c². In the vertical section,

page_text: Fig. 2, the lever b¹ is seen as acting against a lever which operates on a
valve & that is connected to the steam pipe R by a smaller pipe f¹. When
the expansion 1ods force out the valve e', steam will pass up the tube g¹, and
force in a piston at . and will close the damper 2', by an arrangement of
lovers, the action of which will-be-1cadily understood on inspection To cause
the lever to return with certainty to its place when the expansion bais
contract, I apply a weight to a cord that passes over a pulley ¹ The fiont
of the furnace, it is to be observed, is to be so stayed that the whole expansion
of it and of the boiler shall be towards the back Instead of carrying the
steam from the ordinary safety valve through the waste steam pipe W, W, as
herein-before mentioned, I sometimes adopt the arrangement of admitting a
portion thereof by the action of the expansion rods In this case, in addition
to the ascending tube g,g, that gives a passage to the steam that is to close the
damper ', I allow a tube g" to descend from the chamber of the valve e¹ and
to enter the ash pit, the portion of steam that descends through this tube will
co-operate with that which ascends through the tube g¹ in damping the fire.
The expansion bars are to be made of any suitable composition, and these
when the boiler is of non aic to be enclosed in tubes of iron, the expansion of
which will be the same-with-that of-the-boiler; when the boiler is of copper
the enclosing tubes must be of that metal, by the enclosing tubes the expan-
sion bars are kept from the contact of moisture, and all galvanic action is
thereby prevented The operation of the expansion 1ods when ananged in
the manner described will be such as to insure the operating of the whole
amount of then expansion, upon the apparatus by which the damping of the
fire is to be effected. In Fig 29 I have shown another modification of
the manner of operating the damper in the chimney by the pressure of the
steam alone without the expansion 1ods, in this Figure is the chimney, and
m³, the damper, n'is a steam tube, leading from the steam pipe to the valve oi
piston chambor o', when the pressure of steam is such as to force the valve
or piston out, steam will be allowed to pass down the tube p³ into the ash pit;
the piston on valve 1od q will also act upon a lever 1, and drawing on the
rod s, which is furnished with a slot and a regulating screw to regulate its
action, it will close the damper m², by the arrangement clearly epicsented in
the Drawing The pressure is indicated by an ordinary spring scale t¹
intend to create a draught through the chimney by means of a revolving
exhausting fan, having curved vanes, and placed at its upper end, said fan is
peculiarly constructed. Fig 30 is a top view of my revolving fan (the plate w¹
being removed), which tuins with a shaft v¹ the chimney (Fig 1) This
revolving fan is to be driven by an auxiliary engine or otherwise by means of
I

page_text: the shaft v. The top of the chimney 1 cover by means of a disk or plate w¹,
by which device the fan is rendered much more effective than any other, the
whole of the exhausted air being thrown out laterally. The top plate w¹ may
be attached to the vanes of the fan, or may be sustained immediately 'above
it In Fig 29 is a section of a steam pipe, which is intended to be
connected with the auxiliary engine This has a valve in it at y', which is
opened in a greater oi.less degree by the pressure of the steam on the valve
in the chamber o¹, and consequently determines the force with which the fan
wheel will operate
For regulating the supply of water I use a float of a
peculia construction, which is shown in Figs. 31 & 32. A" is a hollow
cylinder, which constitutes the float, and 13", 13, aic tubulai arms opening into
said float, which work in clasps or boxes at all.. The tubular aims B enter
the lower side of the float A", as shown in the section, Fig 32
The object
of this arrangement is to allow any water which may leak into the float fiom
any fault theicin to be discharged by its own gravity at the end 6, Fig. 31;
the end passes through a stufling box at c", and d" is a pointer attached to it
on the outside of the boiler which indicates the height of water on the gradu-
ated scale ef" is a pipe which may supply water by means of an auxiliary
engine, and which may have a valve at g", which may be opened by the 10d h¹.
Fig. 33 is a sectional view of an apparatus, which I denominate a'salt
metic, which is intended to point out the degree of saturation of 'the water.
Fig 34 is a fi ont view of it c is a tube, the upper part of which enters the
boiler at the steam chamber,' its lower part entering it low down in the wate
space,, this communicates with tlie tubular apparatus D", D", which contains
an hydrometer: By raising the handle E" two cocks 1, 2, will be opened,
and water will enter the lower part of the apparatus D", and steam its upper
part. is the hydrometer, and " its stem ,, is a glass tube that
surrounds the body 7" of the hydrometer, and m", one that surrounds its upper
pait or stem. " is a pointer, that is to be set to the height of the water in the
tube, is a graduated scale so divided as to indicate the degice in
which the water is saturated with salt, which can be read off by the top of the
hydrometer stem, this scalo may be raised or lowered by means of a set screw
n, and the pointer being placed at the water surface the scale will always be
in its 1ght place, should more water be admitted than is desued a portion
may be drawn off by the cock o¹¹ The spial springs 2", ", are intended to
guard against the effect of percussion from any sudden action on the hydrometer.
Having thus fully described the nature of my respective improvements in
steam boilers and steam engines, and also in steam vessels and machinery for
propelling the same, what I claim therein as new, and desire to secure by

page_text: Letters l'atent, is the manner herein set forth of so constructing an upright
tubular boiler as that the furnace or fue chamber from which it is to be heated
shall be placed on one side theicof, and that the flame and heated an there-
fiom shall hist be made to pass among the tubes at the upper portion of the
boiler, and thence to its lower pait, over and under a partition or diaphragm,
as set forth
-
I claim the so constructing of the boiler as that its bottom shall be entuely
removed from the direct action of the fire, and also the making such bottom
conves, for the purpose set forth, and providing it with a blow-off valva situated
at the lowest point of the button theicot for blowing off the loose sedi-
mentary matter that will be deposited the cou. by which aangement an
effective cuculation of the water through the tubes is secured and incrustation
altogether prevented.
I clum the employment of a shield in the steam chamber below the top of
the steam boiler, ananged and combined for the purpose and m the manner
made known I claim the particular manner of consuming the smoke by
feeding the fue through the respective doois B, B, situated at the sides of the
furnace. I do not claim the burning of the smoke by causing it to pass over a
clear fine, this having been frequently done, but I limit my claim to the special
alangement heicin set forth 1 claim the particular manner of attaching the
top of the boiler to the sides thereof by causing it to slide and to be secured in
place, as described
I claim the manner of affixing the vertical tubes in the upper and lower
heads by scicwing them into the former, making then lower ends comical, and
iveting them over on the lower head I claim the particular manner of apply-
ing packing, which I have described as used within the top of my boiler, by
inserting a rope-like packing in a suitable rccess in such manner as that it will
be made to pack securely by the action of the steam upon it I claim the
manner of admitting the waste steam from the ordinary safety valve into the
ash pit under an anangement by which when the pressure is unduly inci cased
at will be made to damp the fire, and thereby to regulate the pressure
I claim the manner of ananging the two cylinders of the steam engine by
inventing them, so that they shall stand below the bed plate, their cross heads
being below said cylinders, and in combination therewith. I claim the manner
of connecting the two crank shafts by means of a link by which much 100m 1s
saved and other advantages attamed. I claim the particular manner of form-
ing the shaft 1' as described, & for the purpose set forth, and this I claim
whether said shaft be applied to a propelling wheel or to any other purpose
where such a shaft may be desirable.

page_text: I claim the manner of ananging and combining the propelling wheel I'
with the steam engine, and with a vessel. said wheel having its gudgeons in
boxes in a sliding piece, in such manner as that it may be raised or lowered by
the ducct action of the engine, by means substantially the same with those
described and represented I claim also the combining therewith of the valve
m for the purpose and in the manner set forth
I claim the within-described aangement for aflixing two propeller wheels
varying in size, and so combined with a ship or vessel as that either of them
may be made to assume its proper place in the stein for propelling, or that
both may be raised out of the water when propelling is not to be effected, the
aising and lowering being performed by the duect action of the engine, by
means substantially as described.
I claim the manner set forth of 1olling the edges of wrought non plates for
the construction of vessels, boilers, and other structures appertaining thereto, so
that protuberances and depressions may be formed along them which shall fit
into caclı otlıcı, upon the pinciple exemplified in Figs 19 to 26 in the accom-
panying Diawings
I claim the manner of forming grate bais of wrought non, by giving to them
a V form, for the purpose of ictaming ashes and preventing then burning out,
said bais being formed either in one or two pieces, as described
I clann the manner herem described of applying expansion bais 01 1ods to
the boilers of steam engines for the purpose of preventing explosions, this
improved manner of applying them consisting in the airangement of the parts:
by which the whole expansion of the boiler shall be from its front to its back
end, and the whole expansion of the 1ods shall operate on a valve or other
analogous device at the front, so as to close a damper in the chimney and
egulate the fic substantially as set forth I claim also the manner of closing
the damper epi esented in Fig 29 of the accompanying Diawings by the
pressure of the steam alone, as liciein described
I claim the manner of applying a revolving fan on the top of the boiler
chimney for the purpose of producing a draught by exhaustion, said revolving
fan being covered at the top for the purpose and in the manner set forth.
I claim the manner herein described of constructing a float for regulating
the supply of water, said float being provided with hollow arms for the dis
charge of any water that may leak into it, and being other wise formed and
operating as herein made known
I claim the employment of a salt metre for ascertaining the degree of satu-
ration with salt of the water in a boileı, said salt metre being constructed and

page_text: connected with the boiles, in the manner described or in any other that is
substantially the same
In witness whereof, I, the said James Montgomery, have hereunto set my
hand and seal, 'this Thirty-first day of October, in the year of our Lord
One thousand eight hundred and forty-six
Taken and acknowledged by James
Montgomery, Esqr, at the City
of New York in the United
States of America, this Thuty-
first day of October, 1846, before
JAMES (LS) MONTGOMERY.
W. HORNE.

page_text: AND BE IT REMEMBERED that on the oath of Henry Пeitslet the
pecification aforesaid was enrolled word for word as above written And
also the Specification aforesaid was stamped according to the tenor of the
Statute made for that purpose
Enrolled the Twenty-sixth day of November, in the year of our Loid One
thousand eight hundred and forty-six.