Improvements in Miners' Safety Lamps.
Year: 1889

page_text: Date of Application, 15th Nov., 1889
Complete Specification Left, 20th May, 1890-Accepted, 19th July 1890
PROVISIONAL SPECIFICATION.
Improvements in Miners' Safety Lamps.
I THOMAS BENNETT of Wosborough Dale near Barnsley in the County of York
Mining Engineer do hereby declare the nature of this invention to be as follows:-
My present invention relates to Miners' Safety Lamps and has for its object the
combining of the quality of safety with simplicity of construction, and at the same
time to secure an illuminating power equal if not superior to that produced by any
form of Miners' Safety Lamp at present in use; to obtain which I introduce certain
improvements so that any ordinary safety lamp, such for instance as the Mueseler,
can be easily and without any large outlay or expense be altered so as to be con-
structed according to iny present invention, that is to say I employ three cylindrical
gauzes which telescope one within the other, the outer gauze being the greater length,
the middle gauze a little shorter, and the inner gauze somewhat shorter still, so that
a suitable space is arranged between the inner top of outer gauze and outer top of
middle gauze, and also a suitable space between the inner top of middle gauze and
outer top of inner gauze..
The bottom part of outer gauze is made with a slight annular projection or flange,
and the bottom part of middle gauze has no such flange but presses over the vertical
flange of a separate metal ring beneath the under portion of which an annular projec-
tion or flange formed at the bottom of the inner gauze rests.
At a suitable distance above the flame I suspend or fix by means of a horizontal
flange or ring made of two or more thicknesses of gauze, a metallic chimney, prefer-
ably composed of copper, the upper part of which has either made therewith or
attached thereto a perforated cap. I would have it understood that the top ends of
the cylindrical gauzes are covered over with gauze in the usual way. In fitting up
my improved lamp the three before described cylindrical gauzes, after being telescoped
in the manner specified, are placed within the frame of the lamp in a vertical position
at a suitable distance above where the wick or flame will be situated; then the said
chimney is placed so that its upper part or perforated cap extends vertically within
the inner gauze, and the horizontal flange of gauze which supports said chimney is
arranged so that the outer periphery thereof comes under the flanges of the outer and
inner gauzes and the separate flanged metallic ring, and when the ordinary ring with its
asbestos expansion washer is placed under the said gauze flange, and the cylindrical glass
is screwed tight up thereto by means of the loose screw ring and under expansion washer,
the gauzes and chimney are held firmly in required position, and it is only then necessary
to trim and light the wick and then screw the reservoir portion of lamp to bottom
part of frame and rivet up in the usual manner, when my improved lamp is complete
and ready to be used. The air required to support the combustion of the flame enters
through the lower zones or portions of the three telescoped gauzes and descends
through the horizontal flange of gauze which supports the chimney and then travels
to the flaume; and the products of combustion ascend the vertical copper or other
suitable metal chimney and travel out of the perforated capped portion thereof,
through the upper zones or portions of the telescoped gauzes to the atmosphere
without, by this means the mingling of the carbon-dioxide which results from the
combustion of the oil with the atmospheric air needed for the support of the flame is
obviated.
I prefer to leave the outer gauze exposed to the atmosphere and not to employ a
shield, and as the gauzes are of the most simple form having no solid metallic flanges

page_text: attached they may be easily and expeditiously cleaned should they become clogged
at any time with coal dust or a deposit of carbon.
Dated this 14th day of November 1889
H. F. BOUGHTON, M.I.M.E.,
Barnsley and Sheffield, Agent.
COMPLETE SPECIFICATION.
Improvements in Miners' Safety Lamps.
I THOMAS BENNETT of Worsbro' Dale near Barnsley in the County of York Mining
Engineer 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 present invention relates to miners' safety lamps and has for its object combining
the quality of safety with simplicity of construction and at the same time to secure
an illuminating power equal to that produced by any form of Miners' Safety Lamp
at present in use to attain which I introduce certain improvements so that any
ordinary safety lamp such for instance as the Mueseler may easily and without any
large outlay or expense be altered so as to be constructed in accordance with my
present improvements. In order therefore that these improvements may be clearly
understood and readily carried into effect I attach hereunto two sheets of drawings
illustrative of the same which are to be taken as part of this specification and read
therewith.
Fig. 1 is a sectional elevation of my improved miners' safety lamp and fig. 2 is an
elevation of the same. Like letters of reference designate similar parts in each
figure.
I employ three cylindrical gauzes A B and the gauze A being the longest the
gauze B a little shorter and the inner gauze C the shortest so that a space a¹ is left
between the inner top a² of gauze A and outer top of gauze B and also a suitable
space is left between the inner top 6' of middle gauze B and outer top c' of inner
gauze C.
The bottom part of gauze-A-is-made-with-a- slight annular projection_or_flange a³
and the bottom part of middle gauze B presses or fits over a separate metal ring D
beneath the flange d² of which an annular projection or flange c² formed at the bottom
of gauze C rests. At a suitable distance above the flame EI suspend or fix by means
of a horizontal flange or ring G which is made of two or more thicknesses of gauze a
thimble shaped metal chimney H preferably composed of copper the upper part of
which is perforated as shown.
In "fitting up my improved lamp the gauzes A- B and C are telescoped in the
manner before specified and then placed within the frame J of lamp in a vertical
position above where the wick or flame will be situated when the chimney H is placed
so that its upper or perforated portion extends vertically within the centre of
gauze
and the gauze flange G which supports the same comes under the flanges a and d
respectively then when the ordinary ring K and asbestos expansion washer / is placed
under the said gauze flange G and the cylindrical glass S screwed tight up thereto
by means of the loose screw ring M and under expansion washer n the gauzes and
chimney are held firmly in required position as shown and it is only necessary to
trim the lamp and light the wick F and then screw the reservoir P to the bottom
part of frame J of lamp and then lock the same by any ordinary means when my
improved lamp is complete and ready for use as shown at fig. 2.
The lamp is made with the usual steel shield Q in order to meet the Board of Trade
regulations.
The air required to support the combustion of the flame E enters through the lower
zones or portions of the three telescoped gauzes A B and C descends through the
horizontal gauze flange G which supports the chimney H and then travels to the

page_text: flame E in the course shown by the arrows marked o o and the products of combustion
ascend within the vertical copper or other metal chimney H and travel out of the
perforations thereof through the upper zones or portions of the telescoped gauzes CB
and A and out from the shield Q to the atmosphere in the course shown by the
arrows v. v. by this means the mingling of the carbon dioxide which results from the
combustion of the oil with the atmospheric air needed for the support of the flame is
obviated. By constructing a miners' safety lamp in the manner hereinbefore described
the quality of safety is combined with the simplicity of construction without diminish-
ing the illuminating power of the lamp.
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. In a Miners' Safety Lamp the use of a perforated copper or other metal
chimney H of a thimble form in combination with three telescoped gauzes A, B and C
and a horizontal flange G composed of two or more thicknesses of gauze substantially
as described and illustrated at fig. 1. of the drawings hereunto attached.
2. In a Miners' Safety Lamp the use of a perforated copper or other metal
chimney H of a thimble form in combination with gauzes A, B and C arranged so as
to leave vertical spaces a' and 63 substantially as described and set forth at fig. 1 of
the drawings annexed.
3. In a Miners' Safety Lamp the use of a thimble shaped copper or other metal
chimney H perforated in the manner illustrated at fig. 1. of the accompanying
drawings.
Dated thin 9th L... of M 1900
H. F. BOUGHTON, M.I.M.E.,
Barnsley and Sheffield, Agent.