A NEW DESCRIPTION OF STEAM BOILER SPECIALLY ADAPTED FOR MARINE, LOCOMOTIVE, LAND, AND PORTABLE ENGINES
Year: 1872

page_text: .
LETTERS PATENT to Armand Henry Onffroy, of the Admiralty,
Somerset House, London, for the Invention of "A NEW DESCRIPTION
OF STEAM BOILER SPECIALLY ADAPTED FOR MARINE, LOCOMOTIVE, LAND, AND
PORTABLE ENGINES." - A communication from abroad by Messrs.
Onffroy and Company, of 48, Rue St. Aubin, Angers, Maine-et-Loire,
Bronee
-
COMPLETE SPECIFICATION filed by the said Armand Henry Onffroy
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 30th August 1872, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
Section of the Patent Law Amendment Act, 1852.
5 TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ARMAND
HENRY ONFFROY, of the Admiralty, Somerset House, London, send
greeting..
WHEREAS T
am
in assession of an Invention fox (AND

page_text: PORTABLE ENGINES," and have petitioned Her Majesty to grant unto me,
my executors, administrators, and assigns, Her Royal Letters Patent for
the same, and have made solemn Declaration that the same has been
communicated to me from abroad by Messrs. Onffroy and Company, of
48, Rue St. Aubin, Angers, Maine-et-Loire, France.
NOW KNOW YE, that I, the said Armand Henry Onffroy, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention, and
in what manner the same is to be performed, in and by the following
statement::—
1. This boiler is constructed on an entirely new principle by which
the greatest amount of heating surface is brought into immediate contact
with the fire (departing from the plan observed in the ordinary tubular
boilers), thus generating the maximum quantity of steam obtainable
from a surface exposed to the direct action of the flames.
2. The crown of the furnace marked A in the Drawing annexed, is
arched and from its curvilinear form concentrates the heat, and allows
the flames to pass without contraction up to the mouth of the uptake B.
The radiation of heat from the grate to the uptake is very considerable.
3. The boiler is connected with a central tube D, which serves also
as a fire-bridge by tubes passing from the central tube through the
furnace crown A; by this means these tubes being surrounded by the
flames the water is kept in rapid circulation, which greatly accelerates
the generation of steam.
4. The furnace front or frame L is made in the form of a mill hopper
and raised a little above the furnace mouth M to prevent the cold air
entering by the door N when putting on fuel.
5. The heat of the gases, which on entering the uptake B are at a
very high temperature, is utilized, by placing round the funnel a reser-
voir containing the feed water which is supplied to the boiler by a pipe
connecting the reservoir at the point H with the central tube D. The
boiler is thus supplied with hot water, and the funnel kept from getting
over heated, both which advantages, although not new in idea, are
difficult to secure in ordinary boilers by the means here adopted.
6. The heating surface being much less than that required in ordinary
tubular boilers there results a considerable diminution in the size and

page_text: weight of the boiler, and therefore a great reduction in the cost. The
boiler can be easily constructed, and from all the parts being accessible
can be readily cleaned, it requires but little sweeping, an operation
attended with great difficulty in a rough sea, it takes but a very short
time to get up steam, and therefore economises both time and fuel.
Dated this 30th day of August, in the year, of our Lord One
thousand eight hundred and seventy-two.
ARMAND HENRY ONFFROY. (L.S.)