Improved Fire Apparatus for Heating Rooms.
Year: 1899

page_text: Date of Application, 27th June, 1899
Complete Specification Left, 4th Aug., 1899-Accepted, 9th Sept., 1899
Improved Fire Apparatus for Heating Rooms.
NINA DUNBAR, 8, Onslow Square, S.W., Wife of William C. Dunbar, Esq.,.
C.B., Scottish Office, Whitehall, do hereby declare the nature of this invention
to be as follows:-
bars.
A swinging fire-grate shaped like a gypsy caldron, but with open perpendicular
It is suspended by chains (tripod) which are fastened to a horizontal bar
of iron fixed in the chimney. 1.
NINA DUNBAR, 8, Onslow Square, S.W., Wife of William C. Dunbar, Esq.,
C.B., of the Scottish Office, Whitehall, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:
The apparatus is a swinging fire grate, shaped like a gypsy caldron, but with
open perpendicular vertical bars. It is suspended by three chains from a hori-
zontal iron bar in the chimney of the room, at the level of the lintel of mantel
piece. The chains at the upper ends are held together by the last links in a
triple hook 3 inches long, with a loop at top in which the horizontal bar is
inserted. Each chain is 1 ft. 5 in. long, of 2 inch links, made of inch rod iron.
At the lower ends of these chains, the last links are inserted into 3 curved iron
hooks, 2 inches (about) long, rivetted at regular intervals into the outside of
the top of the caldron. The top member of the caldron forming the lip consists
of a circular band of iron 24 inches wide & inch thick, having an extreme
diameter of 1 ft. 2 in. on the upper edge & 1 ft. & inch. on the lower edge.
On the inner side of the top band, the ends of 20 vertical bars are fixed at regular
intervals by one 36th iron rivet to each end. The heads are on the outside of
the top band, & are round, & project. The 20 vertical iron_bars are each at the
top & of an inch: & at 1 of their length from the top, increase in width to
one inch, & return to their first dimensions at the lower ends. The vertical bars
are secured at their lower ends to the outside of a circular horizontal iron
band, inch by inch in section, & 10 inches in diameter. The lower band is
fixed 1 ft. 2 in. below the upper edge of the top band-the vertical bars are
bulged gradually outwards from the top band at the distance to the lower

page_text: band; & in the remaining 3d of their length they curve inwards until they
touch the lower band. The diameter of the circle they enclose is 1 ft. 3 inches.
The vertical bars immediately under the three iron hooks on the top band, are
prolonged past the lower band for 4 inches, & form three feet very slightly
curved & tapering outwards. The rivetting of the vertical bars to the lower
band is covered by an outer inch band of iron, 1 inch in width. It is kept in
position by three rivets one at each of the points where the vertical bars with
feet pass the lower band. The bottom is formed by a inch cast iron plate,
10 inches in diameter, pierced by 17 small circular holes. It rests loosely on
the top of the lower band. The bottom of the caldron should be about 7 to
8 inches from the hearth.
Either coal, coke, peat or wood can be used in this grate; & as the heat it
emits is very great owing to the strong draught caused by it's peculiar construc-
tion, it is admirably adapted for heating purposes in large dwellings. It draws
well, is inexpensive to purchase, & is easily kept in good order.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1st that it possesses the novelty of being a swinging and suspended grate;
2ndly that it's construction is of a new character;
3rdly that its use for heating purposes is far beyond that of any ordinary
fire-grate.