IM- PROVEMENTS IN COOKING AND HEATING BY GAS
Year: 1878

page_text: LETTERS PATENT to Andrew Sweet, of 102, Hampstead Road, in the Parish of
St. Pancras, and County of Middlesex, Ironmonger, for the Invention of "IM-
PROVEMENTS IN COOKING AND HEATING BY GAS."
PROVISIONAL SPECIFICATION left by the said Andrew Sweet at the Office
of the Commissioners of Patents on the 31st May 1878.
ANDREW SWEET, of 102, Hampstead Road, in the Parish of St. Pancras, and
County of Middlesex, Ironmonger. "IMPROVEMENTS IN COOKING AND HEATING
BY GAS."
.
In this Invention I generally make the burners of the kind known as atmospheric,
and of the bar form, with the burner holes as close together as possible. I some-
times place a number of these burners side by side, forming in shape a gridiron,
thus making a very condensed and powerful burner. Immediately above these
burners, or at the side, I place a slotted plate, each slot being exactly over the holes
forming the burner, the object being to prevent the admission of atmospheric air
into the chamber primarily heated.
As to the position or piling of these burners in the case of heating an oven or
hot-air chamber I place one or more of these burners at the top and bottom or
other convenient place, while in my boiling arrangement I place one above another
in any number, according to requirement. This will be better understood on my
explaining the principle of my boiler, which I make of long tubes coiled in flat or
table fashion, leaving a space of a few inches between each complete coil. Thésé
coils are connected together so as to allow a free waterway from coil to coil and
from series to series. To every series of these coils, which may be made of three or
four single coils, I place under the lower or bottom one a burner of the principle
herein described, then another under the next series, and so on, thus making it
Price 6d.1:

page_text: possible in a condensed and useful form to obtain any quantity of water, hot or
boiling, immediately on lighting the gas. Above the top coil of each series I place
a plate to prevent the products of combustion from the first set of burners mingling
with the atmospheric air for the supply of the next.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by 5
the said Andrew Sweet in the Great Seal Patent Office on the 30th November
1878.
ANDREW SWEET, of 102, Hampstead Road, in the Parish of St. Pancras, and
County of Middlesex, Ironmonger. "IMPROVEMENTS IN COOKING AND HEATING
Fig. 1 shows the arrangement and principle of my bar burner. The Drawing
illustrates what I have termed a piling of burners, with the slotted plate to prevent
as far as possible atmospheric air from entering into the chamber primarily heated,
and so cooling without useful effect the products of combustion. There are only 1
two burners shown, but any number may be added with increasing result. 11
represents the burners; 2¹, the slotted plate; 31, the air balls; and 4¹, the gas
service in Figs. 1 and 2.
Fig. 3 shows the arrangement of my burner as applied to a gas cooking oven;
21, Figs. 3 and 4, show the slotted plate with the section of burner and its position
at both top and bottom of oven.
Fig. 5 and 6 also illustrate a gridiron boiling plate.
Figs. 7, 8, 9, illustrate the application of this principle and the method of obtaining
a large radiation surface for a warming stove. The barbed arrows show the direc-
tion of the products of combustion, while the plain arrows show the direction of the
pure warm air current. The burner is a modification of the slotted plate that I
adopt where tube burners are found desirable, such as in asbestos, gas fires, &c.
Fig. 8 shows the plates 2¹ in plan; Fig. 9 shows the plan of burner plate 81.
Figs. 10, 11, 12, illustrate my water-heating apparatus. The Drawing shows the
principle of piling the burners and coils. Two burners and coils only are shewn,
but any number may be added. 12' show the tubular coil made on the flat in plate
fashion; these may be made in copper or iron, with a space of three-sixteenths of
an inch, more or less, between each coil, as shown, to allow the products of combus-
tion to pass through freely. The union joint 14' shows the method of connecting
one series of coils with the next; the union is accessible for screwing up by a hole
sufficiently large in the cylindrical case; this hole also supplies the air to the gas
burner immediately above it. The bottom coil in rising to the one above passes
through a plate 15', shown in plan at Fig. 11. 5' shows the inlet, and 6¹ the out-
'

page_text: let of this series of coils. Each series of tubes forming a coil are supported in the
case upon brackets 16. 41 shows the burners of the atmospheric kind, shown in
section; these are cylindrical, the gas jet holes being drilled on the inside close
together, all round, as shown by 11. 7¹ is a pipe for carrying off the products of
combustion from the bottom burner. The condensation arising from combustion
falls from the upper coil on to the condensation plate 15', and is carried away by
the pipe 91 into the plate that receives the condensation from the bottom coil 81,
both of which are run off by the pipe 91. The gas service is supplied by the stand
pipe 131; this pipe is always charged with gas, and from this at any point required
gas-cocks are inserted. There are 2 cocks for each burner, the small one 2¹ being a
little jet only; these are always lighted first, and serve to light the large burner 4'.
31 are the cocks for the larger burner.
Fig. 12 is a plan of case with the brackets 16¹ for coils to rest upon.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed or put into practice, I hereby
declare that I claim the herein-before described improvements in gas burners and
heating by gas, as shown in the accompanying Sheet of Drawing and explanation,
it being understood that the details of construction may be varied as found desirable
provided they remain in principle the same.
In witness whereof, I, the said Andrew Sweet, have hereunto set my hand
and seal, this 30th day of November, in the year of our Lord One thousand
eight hundred and seventy-eight.