IMPROVEMENTS IN RHEOMETRIC
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by the said Henri Giroud at the Office
of the Commissioners of Patents on the 2nd September 1878.
HENRI GIROUD, of Paris, Engineer, Merchant.
GAS BURNERS.".
"IMPROVEMENTS IN RHEOMETRIC
My Invention relates to a construction of gas burner with which is combined a
governor or rheometric apparatus for the purpose of regulating the flow of gas,
notwithstanding variations of pressure in the supply. The governor may be either
of the wet or the dry kind, in the one case consisting of a light bell inverted like a
gasometer in liquid, in the other case consisting of a light disc free to rise or
descend like a piston within a cylindrical casing; in both cases the supply aperture
to the burner above the bell or disc is governed by a conical valve or plug attached
to the bell or disc, so as to throttle the aperture the more the greater the pressure
causing the bell or disc to rise.
When the wet governor is used, the burner is made in several pieces, the lower
piece presenting a cylindrical cavity in which the bell works, resting when there is
no pressure on radiating ribs at the bottom of the cavity, and guided by side ribs
so as to rise or descend evenly.
The lower cavity is covered by a cap screwed on, and having on its under side a
diaphragm with a central hole in it governed by the conical plug on the bell. The
cap has one or inore branch passages leading up from it to the burner, which may
be of metal, steatite, or other suitable material. For the dry governor, the lower
cavity is bored truly cylindrical, and closed at the bottom by a screwed cap.

page_text: In the cylindrical interior works the disc, which fits loosely so as to allow leakage
of gas past its edge. The disc is made of aluminium for the sake of lightness, and
secured by a boss of solder on each side of it to a stem that carries a valve governing
the aperture above to the branch passages leading to the burner. From under the
disc there is a lateral by-pass for the gas by a passage governed by a screw cap,
which can be adjusted so as to let more or less gas pass to the upper side of the
disc, according to the needs of the burner.
In constructing the rheometric burners above described, I employ for the casings
alloys of tin, lead, and antimony; for the bell of the wet governor, an alloy of tin,
with 5 to 10 per cent. of nickel, and with a little copper, tungsten, platinum, or
palladium, and for the disc of the dry governor, aluminium; these metals and
alloys not being chemically acted on by the gas.

page_text: The by-pass r is fitted with a notched plug covered in by a screw cap; by
turning this plug more or less round, the passage for gas can be adjusted.
Fig. 5 represents a vertical section of a large rheometric burner with dry governor,
for which might be substituted the wet governor shewn in Fig. 6. In this burner
there is an interior reflecting cone E mounted on a tubular stem N, having openings
q for admission of air to its interior from the tube H, which is perforated at its
Tower part.
The air for this as well as for supplying the interior and exterior of the flame is
admitted through perforations in the gallery G. For convenience of lighting
burners of this kind a small internal jet can be kept constantly burning, this jet
being supplied by a pipe g which leads from an opening n in the side of the stop
cock R so arranged that when the passages M of the cock are in the position shewn
in Fig. 5, closing the supply to the main burner, there is passage for gas by a hole
m to the kindling jet ƒ, the quantity of gas thus supplied to fbeing regulated by a
screw plug p
Having thus described the nature of my Invention and in what manner the same
is to be performed, I hereby declare that I make no general claim to the use of a
governor consisting of a bell or disc and valve subjected to the pressure of the gas
supply for regulating the pressure of gas entering a burner, but I claim,――
First. The combination of a governor of either of the kinds referred to with a
burner supplied from it by branches giving free passage for air to the interior of
the frame, substantially as herein-described,
Second. The construction of burner in combination with a wet governor, as'
herein-described witli reference to Figs. 1 and 2 of the accompanying Drawings.
Third. The construction of burner in combination with a dry governor, as herein
described with reference to Figs. 3 and 4 of the accompanying Drawings.
In witness whereof, I, the said Henri Giroud, have hereunto set my hand
and seal, this Twenty-fifth day of February, in the year of our Lord One
thousand eight hundred and seventy-nine.
;
JULES ARMENGAUD, jeune,
of Paris,
Bd. de Strasbourg, 23,
Civil Engineer.
H: GIROUD. (L.S.)
Witness.