IMPROVEMENTS IN STEAM GENERATORS.
Year: 1866

page_text: LETTERS PATENT to Robert Daglish, of Saint Helen's, in the County of
Lancaster, Engineer, for the Invention of "IMPROVEMENTS IN STEAM
GENERATORS.
Sealed the 26th February 1867, and dated the 30th August 1866.
PROVISIONAL SPECIFICATION left by the said Robert Daglish at the
Office of the Commissioners of Patents, with his Petition, on the
30th August 1866.
I, ROBERT DAGLISH, of Saint Helen's, in the County of Lancaster,
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN STEAM GENERATORS," to be as follows:-
This Invention relates more particularly to multitubular, self-contained, or
other steam generators provided with a combustion chamber, and consists in
the application and use to and in the combustion chamber of any number of
water tubes placed vertically or nearly vertically therein, such tubes opening.
at the lower end into the water space beneath the combustion chamber,
whilst their upper ends communicate with the water space at the top of the
said chamber. I prefer that the combustion chamber be situate at the rear
end of a cylindrical flue containing the furnace grate, and that the products of
combustion pass along a series of return tubes disposed above the main

page_text: cylindrical flue and communicating with a smoke box at the front of the
boiler above the fire-door. The advantages obtained by the use of the water
tubes in the combustion chamber are increased heating surface and better
circulation of the water, whilst as these tubes act as stays the combustion
chamber is considerably strengthened; provision is made for removing
the vertical tubes, and thus enable any repairs to be done to the horizontal
tubes.
SPECIFICATION in pursuance of the conditions of the Letters. Patent, filed
by the said Robert Daglish in the Great Seal Patent Office on the
28th February 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
DAGLISH, of Saint Helen's, in the County of Lancaster, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of August, 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 Robert Daglish, Her special license that I, the said Robert
Daglish, my executors, administrators, and assigns, or such others as I, the
said Robert Daglish, my executors, administrators, or assigns, should 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 "IM-
PROVEMENTS IN STEAM GENERATORS," upon the condition (amongst others)
that I, the said Robert Daglish, my executors or administrators, by an
instrument in writing under my hand and seal, 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 Robert Daglish, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying Drawings, and to the
letters and figures marked thereon, that is to say :-

page_text: My said Invention relates more particularly to multitubular, self-contained,
or other steam generators provided with a combustion chamber, and consists
in the application and use to and in the combustion chamber of a number of
water tubes placed vertically or nearly vertically therein, such tubes opening at
the lower end into the water space beneath the combustion chamber, whilst their
upper ends communicate with the water space at the top of the said chamber.
I prefer that the combustion chamber be situate at the rear end of a cylindrical
flue containing the furnace grate, and that the products of combustion pass
along a series of return tubes disposed above the main cylindrical flue and
communicating with a smoke box at the front of the boiler above the fire
door. The advantages obtained by the use of the water tubes in the com-
bustion chamber are increased heating surface and better circulation of the
water, whilst as these tubes act as stays the combustion chamber is con-
siderably strengthened; provision is made for removing the vertical tubes, and
thus enabling any repairs to be done to the horizontal tubes.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same, and for that purpose I shall
refer to the several Figures on the Sheet of Drawings hereunto annexed,
the same letters of reference indicating corresponding parts in all the Figures.
Figure 1 of the annexed Sheet of Drawings represents a transverse vertical
section of a steam boiler or generator constructed according to my said
Invention, and Figure 2 is a corresponding longitudinal vertical section of the
same.
A is the outer shell of the boiler, and B is a circular flue containing the
furnace C; D and E represent respectively the ordinary fire bridge at the back
of the furnace, and an inverted bridge situate at the entrance to the com-
bustion chamber F. This combustion chamber I provide with a number or
series of vertical water tubes G, G, disposed in one or more rows, which open
at the bottom of the chamber into a hollow water bridge or chamber H
communicating directly with the water space of the boiler beneath the bottom
of the combustion chamber, whilst their upper ends open into the water space
above the combustion chamber, so that a free upward circulation of water may
take place through these tubes. I prefer, when practicable, to employ a
number of return tubular flues I disposed above the main furnace flue, as
shown in my Drawing, but I do not claim such an arrangement as forming a
part of my Invention. These return tubes I open at their back ends into the
combustion chamber, and at their front ends into a smoke box K situate in the
front of the boiler. In order to facilitate the removal of the water tubes for
the repair, removal, or cleaning of the tubular flues I, I propose to secure the

page_text: water tubes G, G, by nuts g, g', at their upper ends, such nuts screwing on
to threads cut on the exterior of the water tubes at their upper ends, and being
tightened respectively. against the upper and under surfaces of the crown of
the combustion chamber, the lower ends of the tubes G being fitted into
sockets, as shown.
Having now described and particularly ascertained the nature of my
said Invention, and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that what I consider to be
novel and original, and therefore claim as the Invention secured to me by
the herein-before in part recited Letters Patent is, the combination with the
combustion chambers of steam generators of a series of vertical or nearly
vertical water tubes disposed therein, substantially as and for the purpose
herein-before described.
In witness whereof, I, the said Robert-Daglish, have to this my Speci-
fication hereunto set my hand and seal, this Twenty-sixth day of
February, One thousand eight hundred and sixty-seven.
ROBERT DAGLISH.
(L.S.)