Improved Construction in Steam Boilers for the better Generating of Steam and Circulation of Water.
Year: 1886

page_text: Date of Application, 16th July, 1886.
Complete Left, 18th Mar., 1887.
Complete Accepted, 3rd June, 1887.
PROVISIONAL SPECIFICATION.
Improved Construction in Steam Boilers for the better Generating
of Steam and Circulation of Water.
AARON METCALF, Old Quay, Preston, Lancashire Machinist and Engineer do hereby
declare the nature of this invention to be as follows:-
Instead of having a open flue or cross tubes as heretofore, I partially fill up
the
space in the boiler flue by inserting a water boiler and connecting the same near the
top and bottom to the steam boiler by water passages, by which means when the fire
heat plays on the said water boiler steam is generated and water circulation is set up.
Dated this Sixteenth day of July 1886.
AARON METCALF.
of Steam and Circulation of Water.
AARON METCALF Machinist and Engineer Old Quay, Preston County of Lancaster
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
Instead of the internal flues of steam boilers being as at present, I insert a
cylindrical water-boiler in each flue, about four fifths the internal diameter of the flue
the same to extend from near the back end of the furnace to the back end of the boiler
and through the flue wall by which it is supported at the back end. By this means the
I Price 1

page_text: furnace heat is brought close to the flue plates the whole length of the boiler as well
as on the inserted cylindrical-water-boiler, so that a greater area and better quality of
heating surface is obtained. The connection of the water boilers with the steam boiler
I effect by means of cone-shaped junctions one of which is near the fore end of said
water boiler and one near the back end of the same, the parts being revited
seperatly to their respective places and afterwards joined by a bolt through the
centre hole.
These cone shaped junctions are intended for the purpose of facilitating the putting
in and taking out of the water-boilers when required.
The back end of the said water-boiler is provided with a removable cover to answer
as a man hole.
The accompanying drawings are intended to assist inore fully to explain the nature
of my invention.
Fig. 1 is a side elevation of an ordinary Lancashire boiler with my invention added
shewing one flue, (a) is the said water boiler, (b) is the bottom junction (above
named) forming the water passage from the lower part of the steam boiler to said
water boiler, (c) is the top junction on a similar plan and forms the water passage
from the higher part of said water boiler to the higher part of steam boiler, (d) is the
removable cover at the end of said water boiler, (E) is the flue wall.
Fig. 2 is a plan of the above shewing both flues with the said water boilers added.
Fig. 3 is a back end view of a steam-boiler shewing (a a) the said water-boiler
(bb bb) the bottom and top junctions.
Figure 4 is an enlarged setional view of the bottom junction shewing the two
parts together, (a) is the part revited to the said water-boiler, (b) the part revited to
the flue of the steam-boiler, (c) an insertion ring of soft substanco preferably india-
rubber inserted in a small cavity provided to receive it at the bottom of the cone
junction, the same being pressed very tight when the metals of the said cones come in
contact with each other, (ee) are bridge pieces, (d) is a bolt to hold them firmly
together.
Fig. 4 A is a sectional view of the said insertion-ring.
Fig. 5 is the top junction on a similar plan to fig. 4. These junctions may be either
cone shaped or flat.
Having now particularly described and ascertained the nature of my said invention
and, in what manner the same is to be performed I wish it to be understood that I do
not confine myself to the precise details as it may be necessary to vary the size and
shape of said water-boiler to suit particular cases, but I declare that what I claim is
First. The insertion in the internal flues of steam-boilers a cylindrical water-boiler
of as large a size as said flues will admit without interfering with the draught and
generally speaking about four fifths the internal diameter of the boiler flue as shewn
in fig. 1 and 2.
Second. The junction forming connections and water passages to and from the
steam and water boilers as shewn and set forth in the foregoing descriptions.
Third. The cover at the end of the said water boiler as before described.
Also the general arrangements of the parts here set forth.