Ix- PROVEMENTS IN STEAM BOILERS
Year: 1866

page_text: LETTERS PATENT to William Clark, of 58, Chancery Lane, in the County
of Middlesex, Engineer and Patent Agent, for the Invention of "Ix-
PROVEMENTS IN STEAM BOILERS."-A communication from abroad by
Laurent Chevalier, Engineer, of 29, Boulevart St. Martin, Paris.
Sealed the 10th May 1867, and dated the 21st November 1866.
PROVISIONAL SPECIFICATION left by the said William Clark at the
Office of the Commissioners of Patents, with his Petition, on the
21st November 1866..
I, WILLIAM CLARK, of 58, Chancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN STEAM BOILERS," to be as follows:
This Invention relates to improvements in steam boilers.
In the annexed Drawing Figure 1 shows a transverse section of an improved
steam boiler on the line C, D, Figure 2, which is a longitudinal section on
the line A, B, Figure 1.
E, body of the. generator; F, steam chamber, which may or may not be
applied; G, furnace, arranged so as to facilitate the supply of the fuel;
H, heating flue for conducting the heated gases to the bent return heating
flues. I, which serve to distribute and multiply the surface of the heated gases.
before they pass out at the chimney; J, door at the back of the boiler. for
cleaning and inspecting the flues; K, fire-bars; L, furnace and ash-pit door.;
M, smoke box, into which the heated gases pass from the bent flues I;,

page_text: N, funnel, which may be made in one piece or hinged to the boiler; O, flange
joints, by means of which the end plates are bolted to the body of the boiler,
and removable, so as to permit of the furnace and flues being taken out in
order to clean or repair them with facility. A generator arranged as shown in
the Drawing may be made of any desired form according to the requirements
of each case. The bent form of the heating flues allows of their free expansion
without strain on their rivets, as they are not subject to any tension, and this
method of connection renders them. easy of removal, access being had for the
purpose by the door or man-hole at the back of the boiler. The pressure in
the boiler tends to tighten the tube joints at the rivets, and by this means
prevents any rupture, which is frequently the case in boilers where the tubes
have to support the whole pressure in the boiler.
The advantages possessed by these improvements are as follows:-Ist, a
large heating surface is obtained with a boiler of small size, while at the same
time having a sufficient amount of water for such surface; 2ndly, the facility
for removing the furnace from the boiler by the employment of bolts and
flanges in the manner described; 3rdly, the capability of placing the boiler
either horizontally or vertically, in which latter case the body would require
to be lengthened or have an addition made thereto to form a steam chamber;
4thly, besides the above advantages this improved boiler offers great facilities
for cleaning at but a small expense; from this results longer wear and
a saving in fuel in consequence of the evaporating surfaces being kept
thoroughly clean.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark in the Great Seal Patent Office on the 2
20th May 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CLARK, of 58, Chancery Lane, in the County, of Middlesex, Engineer and
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters 3
Patent, bearing date the Twenty-first day of November, in the year of our
Lord One thousand eight hundred and sixty-six, in the thirtieth year of
Her reign, did, for Herself, Her heirs. and successors, give and grant unto
me, the said William Clark, Her special licence that I, the said William
Clark, my executors, administrators, and assigns, or such others as I, 8
the said William Clark, my executors, administrators, and assigns, should

page_text: at any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN STEAM BOILERS," a communication to me from abroad
by Laurent Chevalier, Engineer, of 29, Boulevart St. Martin, Paris, upon the
condition (amongst others) that I, the said William Clark, my executors or
administrators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be performed,
and cause the same to be filed in. the Great Seal Patent Office within six
calendar months next: and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said William Clark, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement, reference being had to the Sheet of Drawings hereunto annexed,
and to the letters and figures marked thereon (that is to say):-
This Invention relates to improvements in steam boilers.
In the annexed Drawing Figure 1 shows a transverse section of an improved
steam boiler on the line C, D, Figure 2, which is a longitudinal section on the
line A, B, Figure 1.
E, body of the generator; F, steam chamber, which may or may not be
used; G, furnace, arranged so as to facilitate the supply of the fuel; H, heating
flue for conducting the heated gases to the bent return heating flues I, which
serve to distribute and multiply the surface of the heated gases before they
pass out at the chimney; J, door at the back of the boiler for cleaning and
inspecting the flues; K, fire-bars; L, furnace and ash-pit door; M, smoke
box, into which the heated gases pass from the bent flues I; N, funnel, which
may be made in one piece, or hinged to the boiler; O, flange joints, by means
of which the end plates are bolted to the body of the boiler, and are thus
removable, to permit of the furnace and flues being taken out in order to clean
or repair them with facility. A generator arranged as shown in the Drawing
may be made of any desired form according to the requirements of each case.
The bent form of the heating Blues allows of their free expansion without strain
on their rivets, as they are not subject to any tension, and this method of con-
neetion renders them easy of removal, access being had for the purpose by the
door or man-hole at the back of the boiler. The pressure in the boiler tends
to tighten the tube joints at the rivetting, and by this means prevents

page_text: rupturing, which is frequently the case in boilers where the tubes have to
support the whole pressure in the boiler..
The advantages possessed by these improvements are as follows:-1st, a
large heating surface is obtained with a boiler of small size, while at same
time having a sufficient amount of water for such surface; 2ndly, the facility
for removing the furnace from the boiler by the employment of bolts and
flanges in the manner described; 3rdly, the capability of placing the boiler
either horizontally or vertically, in which latter case the body would require
to be lengthened or have an addition made thereto to form a steam chamber;
4thly, besides the above advantages this improved boiler offers great facilities
for cleaning at but small expense; from this results longer wear and
a saving. of fuel in consequence of the evaporating surface being kept
thoroughly clean.
In witness whereof, I, the said William Clark, have hereunto set my hand
and seal, this Twentieth day of May, in the year of our Lord One
thousand eight hundred and sixty-seven.