Improvements in Gas Lamps.
Year: 1894

page_text: Date of Application, 8th Sept., 1894-Accepted, 13th Oct., 1894
COMPLETE SPECIFICATION.
Improvements in Gas Lamps.
I THOMAS WILLIAM COWAN of 21 Moorgate Road, Rotherham in the County
of York Gas Fitting Manager do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
The object of my invention is to provide a gas lamp which is simple in
construction and economical in first cost and use and not liable to readily get out of
order and which is very efficient, giving a high illuminating effect relatively to the
amount of gas consumed and being readily managed without skilled attention and
needing no expensive accessories. In a lamp constructed according to my invention
the products of combustion pass to the chimney through a space above the burners
and at the base of the chimney the said space being constituted between a conical
funnel shaped or trumpet mouth termination at the base of the chimney surrounding
the flames and extending upwards into the base of the chimney and a deflector
situated above the said mouth and over the burners the products of combustion
passing between the outer edge of the said deflector and the top of the said mouth
and thence into the chimney.
The accompanying drawings represent in vertical section in Figure 1 a lamp
constructed according to my invention. A is the tube for the supply of gas to the
chamber B and thence to the burners b of which there may be two or more and
which are preferably such as give flat flames inclining outwards as shewn. The
chimney C is supported upon the tube A by means of the arms or brackets c.
Also supported by the said tube A or in other convenient manner is a cap D
leaving a space between itself and the upper end of the chimney for the escape of
the beated air and products of combustion into the apartment in which the lamp is
situated or into the outer air, or a passage leading thereinto, if the lamp is to be
used as a ventilating lamp. The lower part of the chimney is extended outwards
or bell-shaped at C2 and to it is secured the conical, funnel shaped or trumpet
mouth piece E extending outwards beyond the flames and inwards to within the bell
shaped part C. Secured to the tube A is a deflector G extending over the top of
the mouthpiece E and leaving a space 9 between itself and the top of the said
mouth piece E. The said deflector G is made preferably cup-shaped or part of a
sphere with its concave side downwards. This concave or underside is preferably
enamelled with white enamel and the interior of the mouth piece E may be
similarly enamelled. Figure 2 shews a slightly modified construction in which the
mouth piece E is formed partly by an extension E2 of the base of the chimney and
partly by the piece E³, and, if desired, there may be a small space left as at e
between the two parts. The other parts are shewn as being constructed and
arranged as in Figure 1 and they are marked with the same letters of reference.
The deflector G may be made so that it can be adjusted as to its distance from the
top of the mouth piece E so as to regulate the space g to give the best effect. The
deflector G controls the current of air to the lamp and of the products of combustion
therefrom the said products heating the said deflector and the lamp generally in
such a manner as to induce a steady upward current of air which becomes highly.
heated both by the radiated heat of the flames and the transmitted heat of the
products of combustion. The burners should be situated relatively to the deflector
in about the position shewn so as to give as great a reflecting power from the
reflector as possible. Although I have shewn the gas pipe as coming centrally
through the lamp from above, the said pipe may extend into the chamber B, from
below, or from the side, and the chimney, and other parts, be supported in their

page_text: relative positions by any convenient arrangement of carriers, supports, or arms from
the said pipe or other convenient place. I may use a globe or basin to enclose the
flames, necessary openings being provided to allow sufficient air to pass into the
interior of the said globe or basin to support proper combustion of the gas.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The arrangement and combination of parts constituting a gas lamp substantially
as herein before described and illustrated in the accompanying drawings.
Dated this 8th day of September 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, Agents.