IMPROVEMENTS IN GAS LAMPS
Year: 1885

page_text: I HENRY HARRISON DOTY of 446 Strand in the County of Middlesex Late
Captain in the Chilian Navy do hereby declare the nature of my said Invention
for "IMPROVEMENTS IN GAS LAMPS," and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
My invention relates principally to improvements in the construction and
arrangement of gas lamps, and has for its object to intensify the illuminating
power of the light and economise gas.
09-
It consists in the application and use to a gas lamp of special contrivances
combined with air pipes and holes or passages for directing currents of pure air so
as to impinge in a heated state upon the surface of the jet or flame and for heating
and expanding the gas supplied to the burner.
On the accompanying drawing Figure 1 represents a vertical section of my
improved gas lamp having a circular burner from the upper rim of which issue a
series of jets forming a circular flame and Figure 2 a sectional elevation of the lamp
shewing an ordinary or "fish-tail" burner like letters of reference indicating like
parts in both figures.
In carrying out my invention I screw or otherwise fix the lower end of the main
gas pipe a into the upper closed end of a specially shaped circular air chamber or
box 6 the gas passing from the main pipe a through a branch pipe c to the
burner d (or d fig. 2) which is located below and in line with the lower open end
or mouth e of the air chamber or box bat any suitable distance therefrom as
desired-The air chamber or box b is of paralled diameter for a portion of its
length and thence diminishes as shown in Fig. 1 in a curved conical or tapered or
other desired form (say as shown in Fig. 2) to its mouth e as shewn.-Through the
circumference of this conical portion in Fig. 1 are holes or passages f.
Communicating with the upper parallel portion of the air chamber or box bare
air pipes g which are carried at their outer ends by a cylindrical ring or plate h
through which they open out into the surrounding air-The ring or plate h is
secured at its base to the framework i of the lamp on the lower side of which
framework is a flanged ring j (or adjustable clips or holders) for holding the
globe of the lamp. Holes are made through the framework i for admitting air
to the interior of the globe k-At a suitable distance from the ring or plate h is a
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page_text: second cylindrical ring or gallery m also secured at its base to the framework i and
having holes n through its circumference for admitting air to the space between it
and the ring or plate h.
Resting on the pipes g is a conical tube or flue o which surrounds the main gas
pipe a and is retained in position by the ring or plate h against which its lower
edge is in contact.
By means of the above arrangement on igniting the gas issuing from the
burner d (or d¹ figure 2) currents of pure air containing a maximum of oxygen
pass from the surrounding atmosphere through the pipes g into the air chamber or
box b from which they pass through the holes or passages f and lower end or
month e of the box b so as to impinge in a heated state upon the inner or upper
surface of the jet or flame and thereby intensify its illuminating power.
On this air being expanded and deprived of its oxygen the products of combustion
together with those contained in the globe k and derived from the air entering
through the holes pass rapidly away upwards through the tube or flue o thereby
creating a rapid draught and consequent circulation of fresh air through the lamp.
-At the same time the products of combustion in their passage through the tube
or flue o heat and expand the gas in the main pipe a before it reaches the burner
which enables a smaller quantity of gas to be consumed than with a jet or flame
burning under the ordinary conditions.
The use of an ordinary burner arranged according to my invention as in figure 2
has the advantage of not throwing a shadow upon the globe & or objects beneath.
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
1. The application and use in lamps of a specially shaped air chamber or box
open at its lower end and having a series of holes or passages through its circum-
ference in combination with air pipes for directing currents of pure air so as to
impinge in a heated state upon the jet or flame substantially as and for the purpose
berein before described and illustrated by the accompanying drawing.
2. The combination with the main or carrying gas pipe and with the parts
comprised in the preceding claim of a tube or flue substantially as and for the
purpose herein before described and illustrated by the accompanying drawing.
Dated this 14th day of Arigust 1885
PHILIP M. JUSTICE,
Applicant's Agent.