Year: 1888

page_text: Date of Application, 21st Jan., 1888
Specification Accepted, 2nd Mar., 1888
I, ALVIN MOORE CRAIG of Southington, Connecticut, United States of America
Lamp Manufacturer, 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 improvements in argand gas lamps which form the subject of the present
invention relate firstly-to devices for the heating and proper deflection of the air
necessary to promote combustion and secondly to the valve, forming part of the
burner, which regulates the supply of gas thereto.
In the accompanying drawings Figs. 1 and 2 are sections of an arġand lamp with
gallery, chimney and devices for conducting and heating air and fig. 3 is a section of
similar lamp showing improvements in gas regulator.
In figure 1 A is a hollow burner of ordinary construction connected by branch
pipes A with the supply pipe A². The latter is prolonged upwards through the
centre of the burner, the prolongation A³ being stopped or plugged as shown at a.
Fitting concentrically over the part A³ and occupying a position about midway.
between the exterior surface thereof and the interior surface of the burner is a
perforated cylinder B closed at the top by a deflecting plate B₁ and open at the
bottom to allow of the upward flow of air between the branch pipes A¹. This tube is
expanded at the bottom and has projections 6 formed upon or attached to it higher up
to keep it in a central position as regards the burner. The air passing upwards
through the space between the tube A3 and the cylinder B is rarified by contact with
the heated metal and finds its way through the perforations in the cylinder thereby
impinging upon the interior of the burner and becoming more heated, in which
condition it either combines with the gas immediately it reaches the perforated rim a¹
of the burner or continuing to pass upwards it strikes against the plate B¹ and is
deflected downwards towards that portion of the flame which has not arrived at a
state of perfect combustion thus furnishing a supply of heated air to the interior
surface of the least luminous part of the flame. The pillar or plug A³ serves to
steady the flame and may be fixed either to the burner or to the interior of the
cylinder.
Upon the outer side of the burner is fitted the ordinary perforated gallery C which
supports the chimney G and within this fits a conical cap D of non-perforated sheet

page_text: metal open at top and bottom the upper edge d being turned inwards so as to
deflect the air against the edge of the burner. "In order that this air may be heated
the gallery C is surrounded by an inverted cowl E open only at the top
so that air
can only reach the flame by passing downwards over the upper rim of the cowl and
upwards through the bottom of the ordinary gallery C and the interior of the cone D
thus coming in contact with the several heated surfaces presented by the parts CD
and E as well as that of the burner A. In figure 2 of the accompanying drawings
the cap D is continued above the top of the burner and decidedly contracted at d¹
some distance below the rim of the burner thus ensuring a more complete contact of
the air with the heated burner before it reaches the flame. Figure 3 of the accom-
panying drawings shows a section of an argand burner with a regulating valve
consisting of a screwed plug or spindle F having a conical end which fits into a valve
seating in the supply pipe.
To the spindle of this valve is fitted a lever handle F¹ which I make of spring steel
with such a bent that when fitted it tends to spring outward and bind against the
inside of the burner thus rendering the tap secure from accidental derangement.
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 :-
1. The combination with an argand gas burner such as A of a perforated cylinder
such as B so arranged that a portion of the air passing through the perforations
impinges upon the interior surface of the burner substantially as described and
illustrated in the accompanying drawings.
2. The combination with an argand gas burner such as A of a perforated cylinder
such as B inside the burner, a cone D outside the burner and a chimney G outside
the cone the whole being arranged concentrically substantially as described and
illustrated in the accompanying drawings.
3. In an argand gas lamp the combination with the burner of a perforated cylinder
such as B of an interior tube or plug such as A³ for the purpose of steadying the flame
the burner cylinder and plug being arranged concentrically one within the other
substantially as described and illustrated in the accompanying drawings.
4. In an argand gas lamp the combination with the perforated cylinder B of a
deflector B' substantially as described and illustrated in the accompanying drawings.
5. In an argand gas lamp the combination with the cone D of a cowl such as E
substantially as and for the purpose described and illustrated in the accompanying
drawings.
6. In an argand gas lamp having a regulating valve the employment of a spring
lever such as F bearing against some fixed portion of the lamp or burner for the
purpose specified.
Dated this 20th day of January 1000