Year: 1895

page_text: We JOSEPH PRESTWICH of 8 Irwell Park Eccles in the County of Lancaster,
Manager, and THE PROTECTOR LAMP AND LIGHTING COMPANY LIMITED, also
of Eccles, in the said county, Lamp Manufacturers, do hereby declare the nature
of this invention to be as follows:-
This invention relates to the construction of safety lamps principally intended
for use in miues.
The principal part of the invention consists in providing one oil container with a
cluster of two (or more) wick tubes contained in a corresponding number of lamp
tops, each top complete in itself with glass cylinder and gauze top, and by such a
combination we obtain a light as safe as and equivalent or superior to two (or more)
separate lamps, because the top plate, the glass cylinders, the gauze tops and the
base plate can be secured together by one central pillar or rod which may also form
a handle for carrying the lamp. We may however use more than one supporting
pillar, but it will be evident that these need not be arranged in series around the
outside of the lamp as is usual for lamps having only one glass cylinder, such series
of pillars necessarily casting shadows around the lamp.
The pillar or pillars is, or are, passed through suitable tubular holes in the oil
container, which is fixed thereto by a nut beneath fitted on the end of each pillar,
which is provided with a screw thread for this purpose.
We use the same or a
similar screw thread on the pillar for connecting the top plate to the base plate of
the upper part of the lamp by a second nut beneath the base plate, a suitable collar
or shoulder upon the said pillar holding down the top plate, which also keeps the
gauze tops in place. The top and bottom plates of the upper part of the lamp are
formed with suitable sockets for the reception of the glass cylinders, and the
bottom plate fits preferably in a rim or socket around the upper part of the oil
container.
Other means of connecting the upper part of the lamp to the oil container may
be adopted.
We, however, prefer the construction above described as it enables us con-
veniently to use a modification of the arrangements described and illustrated by
the Specification and drawings of our Letters Patent Nos. 3785 and 3786 dated
21st February A.D. 1893 in which the lamp is lighted by electricity.
In this case all the lights of the lamp can be lowered at once by unscrewing the
lower nut or nuts of the pillar or pillars, and thereby allowing the wick_tubes
fixed in the oil container as described in the Specification of our Letters Patent
No. 18226 dated 12th November A.D. 1890 to descend in the extinguishing tubes
which are fixed to the base plate of the upper part of the lamp.
This motion is or may be limited by a pivotted catch similar to that described
in the Specification of our Letters Patent No. 8007 dated 28th April A.D. 1892.
but should this catch be removed we prevent the lamp wicks from possibly
remaining alight owing to a sudden withdrawal of the oil container, by means of a
Hap or plate so connected to the base plate of the upper part of the lamp and
slotted in such a way that a tee headed or similar projection upon the oil container
can be passed through the same at the bottom of the slot and slide upwards
therein. On the withdrawal of the oil container the above flap or plate checks the

page_text: wick tubes in the extinguishing tubes by the contact of the tee hendel or other
projection with the bottom of the slot.
The flap can be readily disengaged from the projection but the slightest check
in the withdrawal of the oil container is sufficient to ensure the extinction of the
lights so that no improper use can be made of the lamp.
A metal cap or casing covers the ganze tops of the lamp and preferably follows
the contour of the oil container as do the top and base plates of the upper part of
the lamp.
We would remark in conclusion that although we prefer the construction which
we have invented and described above, the exact means for connecting the various
parts of the lamp together may vary so long as the principle of construction of the
lamp is retained, namely, the combination with one oil container of two or more
wick tubes and two or more lamp tops each complete in itself with glass cylinder
and safety wire gauze top or chimney.
Dated this 12th day of October 1895.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
Improvements in Miners' and other Safety Lamps.
We JOSEPH PRESTWICH, late of 8 Irwell Park, now of Elm Bank, 72 Eccles
Old Road, Eccles, in the County of Lancaster, Manager, and THE PROTECTOR
LAMP AND LIGHTING COMPANY LIMITED, also of Eccles, in the said county,
Lamp Manufacturers, 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 :-
This invention relates to the construction of safety lamps principally intended
for use in mines.
The principal part of the invention consists in providing one oil container with a
cluster of tw (or more) wick tubes contained in a correspon iing number of lamp
tops each top complete in itself with glass cylinder and gauze top and by such a
combination we obtain a light as safe as and equivalent or superior to (or more)
separate lamps because the top plate the glass cylinders, the gauze and the base
plate can be secured together by one central pillar or rod which may also form a
handle for carrying the lamp. We may however use more than one supporting
pillar, but it will be evident that according to our invention these need not be
arranged in series around the outside of the lamp as is usual for lamps having only
one glass cylinder, such series of pillars necessarily casting shadows around the
lamp.
Our invention will be readily understood from the following description on
reference to the accompanying drawings.
Fig. is an outside elevation of one side of a three light lamp constructed
according to our invention the lights being arranged triangularly.
Fig. 2 is an elevation partly in section of another side of the lamp.
Fig. 3 is a transverse section taken through the glass cylinders.
Fig. 1 is a detached view of a part hereafter more particularly referred to.
Fig. 4 is an elevation showing a four light lamp with the glass cylinders
arranged in a row or single line.
is the oil container, & are the wick tubes, each being in a separate lamp top
complete with cylinder c and gauze top d and chimney, is the central pillar
or rod securing the top plate to the base plate g.
C
The pillar is on ilio drawings shown as made with a loop or handle et for
carrying the lamp. Fig. 4 shows pillars ee one on each side of the pillur e.

page_text: The pillar e or pillars e e¹ es, is, or are, passed through suitable tubular holes
see Fig. 2, in the oil container a, which is fixed thereto by a nut beneath fitted
on the end of each pillar, which is provided with a screw thread for this purpose.
We use the same or a similar screw thread on the pillar for connecting the top
plate to the base plate g of the upper part of the lamp by a second nut beneath
the base plate, a suitable collar or shoulder e upon the said pillar holding down
the top plate, which also keeps the gauze tops d in place. The top and bottom
plates and g of the upper part of the lamp are formed with suitable sockets + g*
for the reception of the glass cylinders e, and the bottom plate 7 fits preferably in
a rim or socket at around the upper part of the oil container a.
Other means of connecting the upper part of the lamp to the oil container may
be adopted.
We, however, prefer the construction above described as it enables us con-
veniently to use a modification of the arrangements described and illustrated by
the Specifications and drawings of our Letters Patent Nos. 3785 and 3786 dated
21st February 1893, in which the lamp is lighted by electricity.
In this case all the lights of the lamp can be lowered at once by unscrewing
the lower nut or nuts of the pillar e, or pillars, and thereby allowing the wick
tubes fixed in the oil container as described in the Specification of our Letters
Patent No. 18226 dated 12th November A.D. 1890, to descend in the extinguishing
tubes which are fixed to the base plate of the upper part of the lamp.
This motion is or may be limited by a pivotted catch similar to that described
in the Specification of our Letters Patent No. 8007 dated 28th April A.D. 1892,
but should this catch be removed we prevent the lamp wicks from possibly
remaining alight owing to a sudden withdrawal of the oil container a, by means of
a flap or plate / so connected (see also Fig. 1A) to the base plate g of the upper
part of the lamp and slotted (see Fig. 1) in such a way that a tee headed or similar
projection m upon the oil container a can be passed through the same at the bottom
of the slot and slide upwards therein. On the withdrawal of the oil container a
(sce. dotted lines Fig. 1) the above flap or plate checks the wick tubes in the
extinguishing tubes by the contact of the tee headed or other projection m with
the bottom of the slot 1+.
The flap can then be readily disengaged from the projection m but the
slightest check in the withdrawal of the oil container a is sufficient to ensure the
extinction of the lights so that no improper use can be made of the lamp.
A metal cap or casing o covers the gauze tops d of the lamp and preferably
follows the contour of the oil container a as do the top plate and base plate g of
the upper part of the lamp.
We would remark in conclusion that although we prefer the construction which
we have invented and described above the exact means for connecting the various
parts of the lamp together may vary.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
•
The combination with one oil container of two or more wick tubes and two or
more lamp tops each complete in itself with glass cylinder and safety wire gauze
top and chimney substantially as herein before described and illustrated by the-
drawings annexed.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.