IMPROVEMENTS IN SAFETY-LAMPS
Year: 1884

page_text: I, HENRY ARMSTRONG of 43 Manchester Street, Gray's Inn Road, in the County
of Middlesex, Safety-Lamp Manufacturer do hereby declare the nature of my said
invention for "IMPROVEMENTS IN SAFETY-LAMPS "to be as follows:-
This invention has for its object the construction of safety lamps in such a
manner as to admit of the use of a candle as the illuminating agent, instead of
oil, whereby their safety and convenience for many purposes are increased, while
the necessity for, and the trouble attendant upon cleaning are greatly reduced.
The lamp consists principally of two parts, the lower one containing or supporting
the illuminant, and the upper one forming a chamber wherein the illuminant is
consumed, two or more of its sides having plate glass panels.-In some cases one of
tho sides has inserted in it a lens and the opposite one carries a reflector. The
upper part of the upper chamber is provided with a conical gauze cap surrounded
by a perforated chimney lined with wire gauze. The lower part or case of the
lamp is made of tin plate and is closed at top and open at bottom where it is
strengthened by a transverse bar. There are a number of perforations round.
the sides of the lower part of the case, and a screw at and near the top of the
periphery so as to enable the lower part to be screwed into the upper one and
form a close joint by butting against a suitable flange. Extending from the bar
before spoken of at the bottom to the top of the lower part, there is formed a
socket which receives a spring candle holder, wherein the candle is placed.
Between the top of the lower part and the socket two intercepting wire gauze
screens are fixed, and in the top of the lower part there are a number of per-
forations, so that while an ample supply of air for the support of combustion is
provided for, by placing the wire gauze screens in the way described the flame is
prevented from causing any explosion of the outside combustible or explosive gases,
and a most perfect safety lamp is thus secured, whilst possessing all the convenience
attendant upon the use of a candle in lieu of oil as the illuminant,

page_text: I, HENRY ARMSTRONG of 43 Manchester Street, Grays Inn Road, in the County
of Middlesex, Safety-lamp Manufacturer, do hereby declare the nature of my
invention for "IMPROVEMENTS IN SAFETY-LAMPS," and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying drawings and to
the letters and figures marked thereon, that is to say :—
This invention has for its object the construction of safety-lamps in such a
manner as to admit of the use of a candle as the illuminating agent instead of oil,
whereby their safety and convenience for many purposes are increased, while the
necessity for, and the trouble attendant upon cleaning are greatly reduced.
In order that the invention may be more easily understood, drawings are
attached hereto, Fig 1 being a vertical section taken at right angles to Fig 2,
which is an elevation of the lamp. Fig 3 is a plan of the lower part, and Fig 4 is
a plan of the bottom of the lamp looking upwards, while Fig. 5 is an elevation of
the lower part of the lamp drawn full size.
The lamp consists principally of two parts, the lower one A containing or
supporting the illuminant, and the upper one B forming a chamber wherein the
illuminant is consumed, two or more of its sides having plate glass panels C. In
some cases one of the sides has inserted in it a lens D Fig 2, and the opposite one
carries a reflector E Fig 1. The upper part of the upper chamber is provided with
a truncated conical wire gauze cap F, surrounded by a perforated chimney G lined
with wire gauze. The lower part A or case of the lamp is made of tin plate and is
closed at top and open at bottom where it is strengthened by a transverse br.r H.
There are a number of perforations I round the sides of the lower part of the
case, and a screw J at or near the top of the periphery so as to enable the lower
part to be screwed into the upper one and form a close joint by butting against
a suitable flange K Fig 1. Extending from the bar before spoken of at the bottom
to the top of the lower part, there is formed a socket L which receives a spring
candle holder M, wherein the candle N is placed. Between the top of the lower
part and the socket two intercepting wire gauze screens 0, 0, are fixed. In the
top P of the lower part and in the sloping piece of metal Qrthere. are a number
of perforations R so that while an ample supply of air for 'the support of com-
bustion is provided for, by placing the wire gauze screens in the way described
the flame is prevented from causing any explosion of the outside combustible or
explosive gases, and a most perfect safety lamp is thus secured, whilst possessing
all the convenience attendant upon the use of a candle in lieu of oil as the
illuminant.

page_text: 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
The construction of safety lamps with the various air passages arranged and
guarded as herein described and shown on the drawings, and for the purpose
herein before set forth.