IMPROVEMENTS IN STEAM BOILERS
Year: 1872

page_text: LETTERS PATENT to John Musgrave, of the Firm of Messieurs John
Musgrave and Sons, of Bolton, "in the County of Lancaster,
Engineer, for the Invention of “IMPROVEMENTS IN STEAM BOILERS.”
Sealed the 14th February 1873, and dated the 14th December 1872.
PROVISIONAL SPECIFICATION left by the said John Musgrave at the
Office of the Commissioners of Patents, with his Petition, on the
14th December 1872.
I, John Musgrave, of the Firm of Messieurs John Musgrave and
Sons, of Bolton, in the County of Lancaster, Engineer, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN STEAM
BOILERS," to be as follows:-
The object of this Invention is to render steam boilers perfectly safe
for very high pressures, and to cause the products of combustion to
circulate in the most advantageous manner for generating steam, also to
facilitate repairs.
My improved boiler consists of two or more rows of cylindrical com-
nartments connected he

page_text: communication with a steam chamber, and the lower ones are connected
to a mud settler; the fire grates are placed under one end of the upper
compartments, and the products of combustion after passing under the
upper compartments are conveyed into flues in which the under com-
partments are placed, and thence along side flues to the chimney. The
number of compartments in each row-may vary, and the vertical tubes
by which they are connected are made by preference of different
diameters in order that the products of combustion circulating around
them may act with greater effect in heating the water. When repairs
are required an upper and a lower compartment may be removed with-
out disturbing the others by placing blank flanges on the connecting
pipes to the steam chamber and mud settler.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Musgrave in the Great Seal Patent Office on
the 11th June 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, John
MUSGRAVE, of the Firm of Messieurs John Musgrave and Sons, of
Bolton, in the County of Lancaster, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of December, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Musgrave, Her special licence
that I, the said John Musgrave, my executors, administrators, and
assigns, or such others as I, the said John Musgrave, my executors, ad-
ministrators,. and 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 “IMPROVEMENTS IN
STEAM BOILERS," upon the condition (amongst others) that I, the said John
Musgrave, 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
mannėr the same was to be performed, and cause the same to be filed in

page_text: the Great Seal Patent Office within six calendar months next and im-
mediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Musgrave, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement (that is to say) :-
The object of this Invention is to render steam boilers perfectly safe
for very high pressures, and to cause the products of combustion to
circulate in the most advantageous manner for generating steam, and to
facilitate repairs.
My improved boiler consists of two or more rows of cylindrical com-
partments connected by vertical tubes; the upper compartments are in
communication with a steam chamber, and the lower ones are or may be
connected to a mud settler.
And in order that my Invention may be more fully understood I will
proceed to described the two accompanying Sheets of Drawings.
On Sheet 1 Fig. 1 is a longitudinal section of my improved steam
boiler; Fig, 2 is a plan of the same also in section. On Sheet 2 Fig. 3
is a transverse section, and Fig. 4 an end elevation of the same.
a, a, is the upper row of cylindrical compartments, and b, b, the lower
row, the two rows of compartments being connected together by the
vertical tubes c, c. I have shewn four compartments in each row, but
the number may be increased or reduced. The upper compartments a
are connected by the tubes d¹ to the steam chamber d which is provided
with the ordinary safety valves and delivery pipe, and the lower com-
partments b are connected by the tube e¹ to the mud settler c, to which
the blow-off pipe and tap e' are connected. In some cases the mud
settler e may be dispensed with, and the blow-off pipes would then be
connected to the lower end of the compartments b. The fire-grates f
are placed under the projecting ends of the upper row of compartments a,
and the products of combustion after passing under the upper compart-
ments are turned down by the end flue and come back towards the front
of the boiler under the two outer lower compartments b, b, they then
branch inwards to the right and left, and then pass under the two middle
lower compartments b, b, from whence they enter the main flue g which
is in communication with the chimney.
"

page_text: The vertical tubes c, c, connecting the outer compartments a and b,
are shewn in Fig. 2, as being placed alternately near each side of the
flue, the object of which is to cause the products of combustion in
passing along the flues to act with greater effect on the surface of the
said tubes; the same result may also be obtained by making the tubes
alternately of different diameters; the tubes c, c, in the middle flue may
also be placed in the same relative positions if desired, or they may all
be placed in the centre of the compartments a and b.
The improved steam boilers above described being composed of cylin-
drical compartments of small diameter are perfectly safe at very high
pressures; the products of combustion are applied to the greatest
available amount of surface, a complete circulation is kept up in the
water, and repairs are greatly facilitated, as at any time an upper and a
lower compartment can be removed or detached from the others, and by
placing blank flanges on the pipes connected to the steam chamber and
mud settler, the remainder of the boiler may be kept at work.
Having thus stated the nature of my Invention, and described the
manner of performing the same, I wish to remark that I do not intend
to limit myself to the details given, and that I claim the improved steam
boilers consisting of two or more rows of cylindrical compartments
connected together, and the arrangement of the flues for the passage of
the products of combustion as shewn and described.
In witness whereof, I, the said John Musgrave, have hereto
set my hand and seal, this Tenth day of June, One thousand
eight hundred and seventy-three.
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