Improvements in or connected with Safety Lamps.
Year: 1896

page_text: Improvements in or connected with Safety Lamps.
I, ARTHUR THOMAS METCALF JOHNSON, of No. 109, Calabria Road, Highbury, in
the County of Middlesex, retired Civil Servant, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements upon an invention previously made by me
and has for its object to simplify the construction of the lamp made in accordance
therewith.
According to my said former invention, the air to support combustion is passed
through a perforated cone block surrounding the wick tube and passing into a
combustion chamber and the air is admitted at the lower part of a cap arranged at
the upper part of the lamp and descends between two glass cylinders one resting
upon the cone block and the other arranged outside of the same, and thence passes
through the perforations of the cone block to the combustion chamber so that any
dangerous vapours are there burned, whilst the products of combustion pass up
through the inner glass cylinder thence through the chimney, and away.
Now, according to the present invention, the outer glass cylinder is entirely
dispensed with and the perforated cone block is surrounded at a short distance
therefrom with a metal band or vertical wall which at its lower part is threaded to
engage a corresponding part upon the bottom of the lamp and enclosing this metal
band and extending horizontally over the cone block to the glass cylinder and
vertically down outside the metal band is a deflecting cap.
This deflecting cap is around its lower edge furnished with short legs or feet fixed
thereto on the inside thereof so that they will rest upon the floor or base plate of
the lamp and act as distance pieces between the vertical wall of the deflecting cap
and the metal band and thus preserve an air way between those parts.
According to this arrangement, the air to support combustion will pass beneath
the lower edge of the deflecting .cap, up over the metal band, and thence down and
through the perforations of the cone block, whilst the products of combustion will
pass up through the glass cylinder and chimney and away.
If desired the base plate may be perforated to admit a further supply of air and
keep cool the parts.
By the means hereinbefore described, the construction of the lamp is materially
cheapened, the brilliancy of the light is greatly improved, whilst its safety is in no
way impaired.

page_text: I, ARTHUR THOMAS METCALF JOHNSON, of No. 109, Calabria Road, Highbury, in
the County of Middlesex, retired Civil Servant, 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:---
My said invention relates to improvements upon an invention previously made by
me, and has for its object to simplify the construction of the lamp made in accordance
therewith.
According to my said former invention, the air to support combustion is passed
through a perforated cone block surrounding the wick tube and passing into a
combustion chamber and the air is admitted at the lower part of a cap or shield
arranged at the upper part of the lamp and descends between two glass cylinders
one resting upon the cone block and the other arranged outside the same and thence
passes through the perforations of the cone block to the combustion chamber so
that any dangerous gases are there burned whilst the products of combustion pass
up through the inner glass cylinder thence through the chimney and away.
Now, according to the present invention, the outer glass cylinder is entirely
dispensed with and the perforated cone block is surrounded at a short distance
therefrom with a metal band or vertical wall which at its lower part is threaded to
engage a corresponding part upon the bottom of the lamp and enclosing this metal
band and extending horizontally over the cone block to the glass cylinder and
vertically down outside the metal band is a deflecting cap.
This deflecting cap is around its lower edge furnished with short legs or feet fixed
thereto on the inside thereof so that they will rest upon the floor or base plate of
the lamp and act as distance pieces, to preserve an air passage between the vertical
wall of the deflecting cap and the metal band.
According to this arrangement, the air to support combustion will pass beneath
the lower edge of the deflecting cap, up over the metal band, and thence down and
through the perforations of the cone block whilst the products of combustion will
pass up through the glass cylinder and chimney and away.
If desired, the base plate may be perforated to admit a further supply of air and
keep cool the parts.
And, in order that the said invention may be more clearly understood and readily
carried into effect, I will proceed, aided by the accompanying drawings, more fully
to describe the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1. is an elevation of a portion of a safety lamp constructed according to
the present invention.
Figure 2. is a horizontal section taken on the line 1-1 of Figure 1.
Figure 3. is a vertical section taken on the line 2-2 of Figure 1.
Figure 4. is a vertical section of the deflecting cap taken on the line 3-3 of
Figure 5, and,
Figure 5. is an underside view of the deflecting cap.
In the several figures like parts are indicated by similar letters of reference.
As the general construction of the lamp will be fully understood by reference to
the Specification of my said former invention numbered 15703 of 1896, I will in the

page_text: present description only refer to such parts as are intimately associated with the
present invention.
a. represents the oil tank or reservoir, b. represents the cone block, and c. represents
a single glass cylinder, the outer glass cylinder referred to in my said former
specification being in the present case entirely dispensed with.
According to the present invention, the cone block b. is surrounded at a short
distance therefrom by a metal band or vertical wall e. which at its lower part el is
threaded to screw into the correspondingly threaded vertical flange d' of the ring
or frame d. forming the bottom of the lamp, whilst the lower part of the vertical
wall or band e. rests upon the base plate f. which also screws into the flange d' of
the ring d.
Enclosing the metal band or wall e. and extending horizontally over the edge of
the cone block b. to the glass cylinder c: and vertically down outside the metal
band or wall e, is a deflecting cap g. which is around its lower edge furnished with
short legs or feet gl fixed thereto cn the inside thereof so that they will rest upon
the floor of the ring or frame d. and act as distance pieces between the flange d
and the vertical wall of the deflecting cap g. and thus preserve an air way between
those parts and between the metal band e. and the deflecting cap g.
According to this arrangement of parts the air to support combustion will pass
in the direction of the arrows beneath the lower edge of the deflecting cap g. up
over the metal band e. and thence down and through the perforations in the cone
block b, whilst the products of combustion will pass up through the glass cylinder c.
and surmounting chimney (not shown) and away to the outer air.
If desired, the base plate f. may be provided with perforations which may or
may not be controlled by valves, in order to admit a further supply of air and keep
cool the parts, as shown and described with respect to my said former specification.
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:
A safety lamp, comprising a perforated cone block surrounding the burner, a single
glass cylinder carried by the cone block, a band rising vertically from the base of
the lamp at a short distance from the cone block and a cap at the top closely
surrounding the glass cylinder and at the bottom provided with feet upon which it
rests and in its interior furnished with distance pieces the parts being so arranged
that a circuitous air passage leading to the cone block is provided and the necessity
for a second glass cylinder is avoided, substantially as herein shown and described.
Dated this 24th day of July 1897.
VAUGHAN & SON,
Agents for the Applicant..