IMPROVEMENTS IN STEAM-BOILERS
Year: 1880

page_text: "
LETTERS PATENT to Herbert John Haddan, of the Firm of Herbert and
Company, Solicitors of Patents, of 67, Strand, in the City of Westminster,
Civil Engineer, for an Invention of IMPROVEMENTS IN STEAM-BOILERS."
A communication from abroad by Prosper Privat, of Toulouse, in the
Republic of France.
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 8th October 1880.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors
of Patents, of 67, Strand, in the City of Westminster, Civil Engineer.
"IMPROVEMENTS IN STEAM BOILERS." A communication from abroad by Prosper
Privat, of Toulouse, in the Republic of France.
The Invention relates to an internally fired horizontal boiler provided with a
return flue, and constructed in such a manner that the fire box, flues, and smokebox
can be easily detached from the rest of the boiler for cleaning or repairing.
The fire box is preferably made circular in section, the first flue oval and the
return flue made of tubes, the smoke passing from the first flue into the rear
smoke box, which is attached to the rear tube plate and entirely immersed in
water, through the tubes to the front smoke box, and finally into the chimney.
The front tube plate is bolted to angle irons rivetted externally to the boiler
shell, and the back smoke box is likewise bolted to the back tube plate, preferably
by means of angle irons, so that by taking off the bolts from the front tube plate
the latter, together with the front smoke box, the fire box, the two flues, and the
rear smoke box can be bodily removed from the shell, and that the rear smoke box
can be subsequently removed froin the rear smoke plate by taking off the bolts.
The front portion of the shell which receives the fire box is preferably an
upright oval in section and the rear portion circular, while the rear smoke box is
circular but flattened at the top.
The shell, fire box, smoke boxes, and the first fue may be made of iron or steel,
and the smoke tubes of copper or brass.
The boiler is placed on suitable supports, and provided with the usual fittings.
The boiler may be adapted for use as a stationary, locomotive, or marine
boiler.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Herbert John Haddan in the Great Seal Patent Office on the 1st
April 1881.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors of
Patents, of 67, Strand, in the City of Westminster, Civil Engineer. "IMPROVE-
MENTS IN STEAM BOILERS." A communication from abroad by Prosper Privat,
of Toulouse, in the Republic of France.
Figure 1 is a longitudinal section of a boiler embodying this Invention;
Figure 2, a cross section through the fire box; Figure 3, a cross section through
the rear smoke box; Figure 4, a plan; Figure 5, a front elevation, with the fire
doors removed; and Figure 6 a front elevation, showing the fire doors closed.
The main portion or shell of the boiler is formed of a cylindrical and of an oval
part No. 12, the latter being arranged to receive the steam generated by the fire
box No. 1, the oval flue No. 4, and the tubulous part No. 6, which constitute the
principal part of the present Invention.
The flame arising from the grate No. 2 passes through the flue No. 4 into the
smoke box No. 5, which forces the products of combustion to return through the
tubes No. 6, which form the return flue, in order to reach the smoke box No. 7 and
the chimney No. 11.
The fire box is secured to the main portion of the boiler by bolts passing through
the front tube plate and angle irons No. 16, while the rear smoke box No. 5 is
secured by means of angle irons and bolts to the tube plate No. 17.
The grate No. 2 rests at the back on an angle iron fixed to the back of the fire
box, and is held in front by another angle iron secured to the front smoke box at
the height of the dead plate (base of the fire door).
No. 3 is the ashpit.
Small horizontal boilers constructed as described may be made stationary, semi-
portable or portable, and mounted on wheels.
Of the parts not already mentioned but shown in the Drawings,
Nos. 8, 9, and 10 are fire, smoke, and ash doors and hinges.
No. 13, a steam dome provided with the first safety valve and steam pipes.
No. 14, a float provided with the second safety valve.
No. 15, feet or supports for the boiler.
No. 18, safety valves.
No. 19, water gauge, test cock, and pressure gauge.
No. 20, feedwater cock.
No. 21, discharge cock (for water).
No. 22, steam tap.
No. 23, man hole.
It will be seen that the front tube plate, together with the front smoke box, fire
box, the two flues, and the rear smoke box can be detached bodily from the shell
after taking off the bolts from the front tube plate, and the rear smoke box can
subsequently be removed from the flues by taking off the bolts from the back tube
plate, whereby the principal parts of the boiler are made easily accessible for repairs
or cleaning.
CLAIMS.
1. In internally fired horizontal steam boilers the combination of a fire box (1)
with first flue (4), rear smoke box (5), return flue (6), and front smoke box (7),
fitted to the shell of the boiler by bolts or an equivalent joint, which allows the
whole to be detached from the shell without taking off any rivets, substantially as

page_text: 2. In internally fired horizontal boilers the combination of a first flue (4) with a
return flue (6) and a removable cap (5) placed inside the shell, substantially as
described.
3. The combination of a shell (12), fire box (1), flues (4) and (6), and smoke
boxes (5) and (7), constructed and arranged substantially as described and shown
by the Drawings.
In witness whereof, I, the said Herbert John Haddan, have hereunto set my
band and seal, this First day of April, A.D. 1881.
H. J. HADDAN. (L.S.).