Improvements in Gas Fires.
Year: 1896

page_text: COMPLETE SPECIFICATION.
Improvements in Gas Fires.
I WILLIAM M°CAIG of 665 Cathcart Road, Govanhill, Glasgow North
Britain, Gas Engineer, do hereby declare the nature of this invention and in
what mauner the same is to be performed, to he particularly described and
ascertained in and by the following statement:-
This invention has reference to and comprises improvements in gas fires and has
for its object to overcome certain defects in their general construction and primarily
to render these more efficient in respect of their heat giving qualities.
The defects experienced in the usual forms of gas fires are chiefly attributable
to insufficient pressure of gas and air supply to the extreme parts of the mixing
chamber proper.
To overcome these defects I propose to construct the mixing chamber leading
immediately to the burners with divisional chambers and lead independently to
each of these by means of separate vertically curved ducts or passages the gas and
air necessary for the more effectual combustion of the fire.
In order that my invention may be properly understood and readily carried into
effect I have hereunto àppended one explanatory sheet of drawings in the three
figures of which corresponding parts are marked with the same letters of
reference.
Fig. 1 is a front clovation of the burner and fittings of a gas fire which
illustrates one example of carrying out my invention.
Fig. 2 is a vertical section of the same taken on the lines a, b, also representing
a portion of the fire-brick and ball fuel in position and
Fig. 3 is a plan with the fire-brick removed.
The mixing chamber proper marked A, is constructed as shown with a main
central chamber B, and two separate side chambers C and D. Leading from
these chambers B, C, and D which appear externally as one continuous chamber,
are the pas jets or nozzles E, placed equidistantly from one another in the
horizontal plane.
The pipe or tube for supplying the burners with gas is marked F, and is inclosed
by a vertical tube G. of larger diameter into which the gas issues by the jets e. f.g
and h. The jets e, f. g and ft. are in communication with the bent tubes H, and I.
which lead directly to the chambers B. C. and D. respectively. The tubes H are
isolated from 1, by a division or baffle plate as seen in dotted lines (Figure 1).
The curved Bunsen tubes J. supply the air which is made to ascend in the
tubes H, by the pressure of gas at e, and f when it descends with the gas to the
mixing chambers C, aud D, aforesaid; and the Bunsen, tube K, which is shown
vertical aud constitutes the downward termination of the vertical tube G, conducts
the air up to the gns jels g, and h, descending with the gas by the beut tubes I
aforesaid into the central chamber B. as will be seen.
It will be obvious from this arrangement. that an equal distribution of pressure
is obtained and consequently a uniform heat is diffused from every part of
the fire.
Although for example,I have shewn the chamber B. with eight jets or nozzles E
and the side chambers C, and D. with four jets each, it is to be understood
I do not confine myself to this particular arrangement as it may be found
expedient to modify the number in order to meet the requirements of varying sizes

page_text: of fires. And it is further to be understood I do not confine myself to the external
configuration of the respective chambers B, C, and D, being straight, as in some
cases it may be deemed necessary to have them curved and octagonal.
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. The method and means of conveying the gas and air for the combustion of
gas fires by separate vertical ducts or passages into separate mixing chambers_in
order to obtain a uniform pressure throughout the whole length of nozzles
substantially as described and shown in the drawings.
2. The general arrangement and combination of parts operating substantially as
described and shown in the accompanying sheet of drawings.
Dated this 22nd day of August 1896.
WILLIAM MOCAIG,
Applicant.