IMPROVEMENTS IN OUTSIDE FURNACES OF STEAM- BOILERS
Year: 1879

page_text: LETTERS PATENT to Carl Pieper, Civil Engineer and Patent Agent, of 74, Belle-
Alliance-Strasse, Berlin, S.W., Prussia, now of 8, Southampton Buildings,
London, for the Invention of "IMPROVEMENTS IN OUTSIDE FURNACES OF STEAM-
BOILERS." A communication froin Hermann Paucksch, of Landsberg-on-the-
Warthe, Germany.
•
Sealed the 12th September 1879, and dated the 26th March 1879.
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office
of the Commissioners of Patents on the 26th March 1879.
CARL PIEPER, Civil Engineer and Patent Agent, of 74, Belle-Alliance-Strasse,
Berlin, S.W., Prussia, now of 8, Southampton Buildings, London. "IMPROVEMENTS
IN OUTSIDE FURNACES OF STEAMBOILERS." A communication from Hermann
Paucksch, of Landsberg-on-the-Warthe, Germany.
Whereas in boiler-furnaces built of brick-work and placed outside and in front
of the boiler, the crown of such furnaces ordinarily lasts but a short time on account
of the deterioration caused by the heat of the fire. I have invented an arrange-
ment by which their duration is greatly increased.
This arrangement consists in constructing the crown of the furnace of a series of
tubes communicating at one end with the boiler, and at the other end with a
chamber, the top of which is in communication with the boiler by means of one or
more other tubes placed outside or above the furnace.
The said series of tubes is arranged, by preference, in an arc of a circle corre-
sponding to the ordinary form of the furnace crown, and the upper part of the
spaces between the tubes is filled up by firebricks or other fireproof material, which
may be covered on the outside by common brick-work, loam, etc.
The tubes thus forming the crown of the furnace should rise from the fire-door
towards the boiler, so that an efficient circulation may take place within them,
the water passing from the boiler through the outside tube or tubes into the afore-
said chamber, and thence by the series of inside tubes back into the boiler.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Pieper in the Great Seal Patent Office on the 25th September
1879.
CARL PIEPER, Civil Engineer and Patent Agent, of 74, Belle-Alliance-Strasse,
"IMPROVEMENTS
Berlin, S.W., Prussia, now of 8, Southampton Buildings, London.
IN OUTSIDE FURNACES OF STEAM-BOILERS."
Paucksch, of Landsberg-on-the-Warthe, Germany.
A communication from Hermann
When steam-boilers are provided with furnaces built of brick-work and placed
outside and in front of the boiler, the crown of such furnaces ordinarily lasts but
a short time on account of the deterioration caused by the fire, and moreover, &
considerable amount of heat is lost by conduction through and radiation from the
brick-work of the furnace. These disadvantages are obviated by the improved
arrangement of furnace which is represented on the annexed Sheet of Drawings.
The crown of the furnace is constructed of a series of tubes a, a, communicating
at one end with the boiler, and at the other end with a chamber or casing d. A
second communication is established between the boiler and the top or any other
part of the chamber d by one or more tubes e, which lie outside or above the
furnace. The series of tubes a is, by preference, arranged in an arc of a circle
corresponding to the ordinary form of furnace crown, and the upper part of
the spaces between the tubes is filled up by fire-bricks bor other fire-proof material,
which may be covered on the outside by common brick-work, luam, or other suitable
substances which are bad conductors of heat.
The tubes a should rise from the fire-door towards the boiler, so that an efficient
circulation may take place within them, the water passing from the boiler through
the outside tube or tubes e into the chamber d, and thence together with the steam
which has been formed, back into the boiler by the series of inside tubes a, as
shown in the Drawing by arrows.
Opposite to the end of every tube a the chamber d is, by preference, provided
with a cleaning orifice closed by a cover f.
I am aware that an arrangement of boiler-tubes presenting a certain degree of
similarity with the one described has been shown in the Specification of the Patent,
A.D. 1872, No. 1441, granted to A. and J. Stewart and Wetherspoon. In this Speci-
fication, however, it is distinctly expressed that the tubes are to touch each other
and to form a partition, and that one end of each tube is to be contracted, which
all does not apply to the above described Invention. Moreover, in the present case,
the tubes are used exclusively in combination with an outside furnace, whereas in
the Specification referred to there is no furnace of this kind.
Having thus described the nature and object of this Invention, and the manner
in which it is to be carried out in practice, as communicated to me by the inventor,
I hereby claim as new and important features of the same,-
In combination with the outside furnace of a steam-boiler c, the tubes a, a, which
the
establish a communication between the front part of the hoiler and a casing
said casing having a second communication with the boiler by one or more tubes e
placed outside of the furnace, substantially as and for the purpose described.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal, this Sixth day of August, in the year of our Lord One thousand eight
hundred and seventy-nine.'
CARL PIEPER. (L.S.),